This document discusses the legacy of Thomas Cooke and the refracting telescopes produced by his company T Cooke and Sons. It describes how several accomplished astronomers produced impressive observations using Cooke refractors, ranging from 4 to 10 inches, in the 19th century. Reverend William Rutter Dawes used an 8-inch Cooke to produce drawings of Mars that were considered superior to any others. John Birmingham made observations of red stars using a 4.5-inch Cooke refractor in Ireland.
The document discusses plans for a mission to Mars by astronauts Kennedy, Cale, Calea and Josh. They will need to bring supplies like oxygen, water, food and housing for at least 2 years. They will experience lower gravity and thinner air than on Earth. Calea discusses health and safety precautions like bringing oxygen tanks, sleeping pills and dressing appropriately for the cold temperatures. They will need a spacecraft that can withstand extreme temperatures and return them safely back to Earth. Their goal is to find signs of life on Mars and experience living on another planet.
The document traces the history and development of telescopes from their invention in the early 1600s to modern space-based observatories. It describes key figures like Hans Lippershey, Galileo Galilei and Isaac Newton who developed early refracting and reflecting telescope designs. Later inventors such as William Herschel, William Parsons and Grote Reber expanded telescope technology to observe new wavelengths and make new discoveries. Modern telescopes like Hubble, Chandra and the VLA now observe from space and orbit to bypass atmospheric limitations and provide new views into the universe.
This provides a visual map of the exhibition gallery. It helps teachers highlight major themes and key objects to students before the visit. Most of the key objects are hyperlinked to the Museum Online Collection Database for easy reference. It also feature relevant online resources on teaching and learning on the topic of Space.
This document contains 10 multiple choice questions about various topics related to space exploration and science fiction. It includes questions about fictional elements from Star Trek, real space missions and astronauts, astronomical phenomena, and concepts from astrophysics. The questions range from identifying key details to matching concepts with their explanations.
The document discusses a Big Bang quiz containing 15 multiple choice questions about movies, space missions, astronauts, and scientific concepts. It provides clues and videos to help identify the correct answers for each question in the quiz.
An extremely primitive star in the galactic haloSérgio Sacani
1. The document reports on the discovery of an extremely metal-poor star in the Galactic halo, named SDSS J1029151172927.
2. Spectroscopic analysis finds the star has a very low metallicity of Z=#6.9x10^-7, which is 4.5x10^-5 times the metallicity of the Sun.
3. The star's chemical pattern, including an absence of lithium, suggests it formed at a lower metallicity than current theories predict is necessary for low-mass star formation. This supports the idea that low-mass stars can form at even lower carbon and oxygen abundances.
The document discusses plans for a mission to Mars by astronauts Kennedy, Cale, Calea and Josh. They will need to bring supplies like oxygen, water, food and housing for at least 2 years. They will experience lower gravity and thinner air than on Earth. Calea discusses health and safety precautions like bringing oxygen tanks, sleeping pills and dressing appropriately for the cold temperatures. They will need a spacecraft that can withstand extreme temperatures and return them safely back to Earth. Their goal is to find signs of life on Mars and experience living on another planet.
The document traces the history and development of telescopes from their invention in the early 1600s to modern space-based observatories. It describes key figures like Hans Lippershey, Galileo Galilei and Isaac Newton who developed early refracting and reflecting telescope designs. Later inventors such as William Herschel, William Parsons and Grote Reber expanded telescope technology to observe new wavelengths and make new discoveries. Modern telescopes like Hubble, Chandra and the VLA now observe from space and orbit to bypass atmospheric limitations and provide new views into the universe.
This provides a visual map of the exhibition gallery. It helps teachers highlight major themes and key objects to students before the visit. Most of the key objects are hyperlinked to the Museum Online Collection Database for easy reference. It also feature relevant online resources on teaching and learning on the topic of Space.
This document contains 10 multiple choice questions about various topics related to space exploration and science fiction. It includes questions about fictional elements from Star Trek, real space missions and astronauts, astronomical phenomena, and concepts from astrophysics. The questions range from identifying key details to matching concepts with their explanations.
The document discusses a Big Bang quiz containing 15 multiple choice questions about movies, space missions, astronauts, and scientific concepts. It provides clues and videos to help identify the correct answers for each question in the quiz.
An extremely primitive star in the galactic haloSérgio Sacani
1. The document reports on the discovery of an extremely metal-poor star in the Galactic halo, named SDSS J1029151172927.
2. Spectroscopic analysis finds the star has a very low metallicity of Z=#6.9x10^-7, which is 4.5x10^-5 times the metallicity of the Sun.
3. The star's chemical pattern, including an absence of lithium, suggests it formed at a lower metallicity than current theories predict is necessary for low-mass star formation. This supports the idea that low-mass stars can form at even lower carbon and oxygen abundances.
The document summarizes new Chandra and HST observations of the X-ray source IC 10 X-1 located in the nearby galaxy IC 10. The observations confirm that IC 10 X-1 has an average X-ray luminosity of 1.5 × 1038 erg s-1 and is strongly variable. The position of IC 10 X-1, within 0.23 arcseconds, matches the location of the Wolf-Rayet star [MAC92] 17A in IC 10. The observations suggest IC 10 X-1 may be a rare Wolf-Rayet black hole binary system, based on its luminosity, variability, and association with the Wolf-Rayet star.
1) The galaxy merger rate over cosmic time is a fundamental measure of galaxy evolution. Mergers are thought to drive galaxy assembly, rapid star formation, and the formation of spheroidal galaxies and supermassive black holes.
2) While simulations predict that the dark matter halo merger rate increases strongly with redshift, the theoretical predictions for the galaxy merger rate remain uncertain due to the complex relationship between galaxies and dark matter halos.
3) The paper aims to address this problem by calibrating three observational galaxy merger rate estimators - close galaxy pairs, G-M20 morphology, and asymmetry - using hydrodynamic merger simulations. This allows them to determine merger timescales and consistently apply them to observed merger fractions up to
The harps serach_for_southern_exoplanets_02Sérgio Sacani
The document presents an analysis of additional radial velocity measurements of the M dwarf stars Gl 433 and Gl 667C, obtained with the HARPS spectrograph. It finds:
- For Gl 433, one planet (Gl 433b) with a minimum mass of about 5.5 Earth masses and an orbital period of about 7 days. Longer period radial velocity variations are also detected, likely due to magnetic activity cycles.
- For Gl 667C, two planets are found. Gl 667Cb has a minimum mass of about 5.5 Earth masses and an orbital period of about 7 days. Gl 667Cc has a minimum mass of about 4.25 Earth masses and orbits in the habitable zone of its star with a
This document summarizes the results of a 180 ks Chandra-LETGS observation of Mrk 509 as part of a larger multi-wavelength campaign. The observation detected several absorption features in the X-ray spectrum originating from an ionized absorber, including ions with three distinct ionization degrees. The lowest ionized component is slightly redshifted and not in pressure equilibrium with the others, likely belonging to the host galaxy's interstellar medium. The other two components are outflowing at velocities of around -200 and -455 km/s. Simultaneous HST-COS observations detected 13 UV kinematic components, and at least three can be associated with the X-ray components, providing evidence that the UV and X-
The document appears to be a repetition of the same string of characters "1979M&P....21...25G" appearing on multiple lines without any other context. It does not contain enough information to summarize in 3 sentences or less.
This document discusses changes in freshwater pathways in the Arctic Ocean from 2005-2008. Satellite and in situ observations show that freshwater content increased in the Canada basin over this period, balanced by a decrease in the Eurasian basin. This was due to a cyclonic shift in the ocean pathway of Eurasian runoff forced by a strengthening of the west-to-east atmospheric circulation in the Northern Hemisphere, characterized by an increased Arctic Oscillation index. Observations confirm that runoff is an important influence on the Arctic Ocean and that the spatial distribution of freshwater pathways is modulated by the Arctic Oscillation rather than local wind patterns.
- Sundials use the sun's position to tell time and can only be used outdoors during daylight hours without cloud cover. Ancient examples were placed in prominent locations to indicate solstices and equinoxes.
- Stonehenges were used as celestial calendars, burial sites, sacrificial altars, and defensive structures in ancient times.
- Telescopes allow viewing of distant celestial objects like stars, planets, and galaxies. The Hubble Space Telescope is the most advanced telescope currently in use.
- In 1609, Galileo improved upon the recently invented telescope and made several groundbreaking astronomical observations, including mountains on the Moon and moons orbiting Jupiter. He published his findings in 1610, revolutionizing astronomy and challenging Aristotle's geocentric model of the universe.
- Galileo faced backlash from the Catholic Church for his support of the heliocentric Copernican model of the solar system. In 1633, he was tried for heresy, found vehemently suspect of heresy, and spent the rest of his life under house arrest.
- The 400th anniversary of Galileo's first astronomical observations with the telescope is being commemorated in 2009 as the International Year of Astronomy to increase scientific awareness
A Brief History of Light & Photography by Rick DobleRick Doble
This fully illustrated 23 page paper traces the history of photography and our understanding of light from prehistoric times to the present day and also speculates about the future. From Aristotle to Einstein the camera is much older than most realize. Because photography can record fine detail and freeze a moment of the past, it has also transformed our modern understanding of time and also provided a record of the past which was previously unavailable.
"The Armagh Observatory Human Orrey"
Mark Bailey
Presentation of Armagh Observatory outreach initiatives and the Human Orrey. Presented at 2nd UNAWE International Workshop.
(Date: October 2006)
The document provides a timeline of key developments in photography from 470 BCE to present day:
- Camera obscuras were first used in 470-390 BCE to project images onto a screen.
- In the 16th century, camera obscuras were improved by enlarging the hole and adding a lens. In the 17th century, they became portable as sedan chairs.
- The first permanent photograph took 8 hours to develop in 1827 by coating paper with silver chloride.
- Kodak invented the first camera that used film in 1889.
- The first photo of a human was taken in 1838. The first photo of the moon was taken in 1968 by Apollo 8. Modern cameras now use megap
Here is a look inside the book Canada's Stonehenge, the first 40 pages of a 312 page book by Gordon Freeman.
The discovery of a 5000-year-old Sun Temple and an ancient "time machine" - Stone Age calendar - in Canada led scientist Gordon Freeman to ground-breaking discoveries in Stonehenge. During fieldwork and research from 1986 to 2006, Freeman found striking similarities between the surface geometry of the two sites. These similarities push back the boundaries of written history and have far-reaching implications for North American and European history.
Hardcover: 312 pages
Publisher: Kingsley Publishing
Language: English
ISBN-10: 0978452615
ISBN-13: 978-0978452612
actual size of book 24.4 x 17.5 x 3 cm
http://canadastonehenge.com
available through amazon, chapters and quality bookstores in Canada and elsewhere
The document discusses the Hubble Space Telescope, including:
- It was launched in 1990 from the space shuttle Discovery and has received several servicing missions to upgrade its instruments.
- It orbits Earth at an altitude of 340 miles and travels at 27,300 km/h, taking 95 minutes to complete one orbit.
- The telescope is 13.2 meters long and has a maximum diameter, allowing it to take detailed images of space.
Cosmic Search Vol. 1, No. 1Little Green Men, White Dwarfs or Pul.docxvanesaburnand
Cosmic Search Vol. 1, No. 1
Little Green Men, White Dwarfs or Pulsars?
By S. Jocelyn Bell Burnell
"We did all the work ourselves and cheerfully sledgehammered all one summer." Burnell and the antenna.
In all the history of radio astronomy the pulsing signals discovered at Cambridge, England, in 1967 were the most suggestive of an extraterrestrial intelligent origin that have ever been detected. In this article, Jocelyn Bell Burnell tells a delightful, personal story of how she first encountered the signals and what ensued.-Eds.
Ladies and Gentlemen: Before you discover for yourselves let me tell you that I am no expert at after dinner speeches. The nearest I have come was writing a Ph.D. thesis; my supervisor kindly read a draft of it and advised me that it read more like an after-dinner speech than a Cambridge University dissertation. He was right, of course, but it has taken me years to see the funny side of his remark.
There has been a lot of interest shown in the discovery of pulsars, and also some misunderstanding. I would like to take this opportunity of setting the record straight. However, it all happened 8 or 9 years ago, and after such a time there is some difficulty in remembering it all accurately.
The story began in the mid-1960's, when the technique of interplanetary scintillation (IPS) was discovered. IPS is the apparent fluctuation in intensity of the radio emission from a compact radio source. It is due to diffraction of the radio waves as they pass through the turbulent solar wind in interplanetary space. Compact radio sources, e.g. quasars, scintillate more than extended radio sources. Professor Tony Hewish realized this technique would be a useful way of picking out quasars, and designed a large radio telescope to do this. I joined him as a Ph.D. student when construction of this telescope was about to start.
The telescope covered an area of 41/2 acres - an area that would accommodate 57 tennis courts. In this area we put up over a thousand posts, and strung more than 2000 dipoles between them. The whole was connected up by 120 miles of wire and cable. We did the work ourselves - about five of us - with the help of several very keen vacation students who cheerfully sledge-hammered all one summer. It took two years to build and cost about E15,000, which was cheap even then. We started operating it in July 1967, although it was several months more before the construction was completely finished.
I had sole responsibility for operating the telescope and analyzing the data, with supervision from Tony Hewish. We operated it with four beams simultaneously, and scanned all the sky between declinations +50' and -10' once every four days. The output appeared on four 3-track pen recorders, and between them they produced 96 feet of chart paper every day. The charts were analyzed by hand by me. We decided initially not to computerize the output because until we were familiar with the behavior of our telescope and receivers we th.
The document provides a history of the invention and development of telescopes from the early 17th century to modern times. It discusses how Hans Lippershey is generally credited with inventing the refracting telescope in 1608, though others may have contributed. Galileo improved upon the design and was the first to use telescopes to make astronomical observations. Later, James Gregory designed the first reflecting telescope in 1663, and Isaac Newton built the first practical reflecting telescope. Over time, refracting and reflecting telescope designs continued to be improved and developed. Modern telescopes include radio telescopes and space-based telescopes like Hubble.
This document summarizes key events and discoveries in astronomy and paleontology from the 17th century to the early 20th century, including:
- Johannes Hevelius advanced astronomy in the 17th century by accurately describing features of the moon.
- In the 18th-19th centuries, astronomers like Halley, Bradley, and Euler made advances in understanding comets and celestial mechanics.
- In the 19th century, astronomers such as Bessel, Adams, Leverrier, and Galle made discoveries relating to asteroids and the planet Neptune.
- Developments like the spectroscope in the 19th century revolutionized astronomy by allowing the chemical analysis of stars and nebulae.
- In pale
Sir John Herschel was a prominent 19th century British scientist and astronomer who discovered many moons of Saturn and helped develop early photography. In 1835 while in South Africa for astronomical studies, he claimed to have seen fantastical creatures like unicorns, beavers building huts, and spherical amphibians. However, his reports were likely just an elaborate hoax. In 1938, Orson Welles' radio adaptation of The War of the Worlds, broadcast as a series of news bulletins, convinced many listeners that Martians had actually invaded New Jersey, demonstrating the power of media to influence beliefs. Similarly, Ray Santilli in 1995 released grainy film that he claimed showed an alien autopsy in 1947, though
This document provides information about Leonardo da Vinci, notably that he was an Italian polymath born in 1452 in Vinci and lived during the Renaissance. While best known as a painter producing works like the Mona Lisa and The Last Supper, da Vinci was also an inventor, scientist, mathematician and engineer. His conceptual drawings included designs for machines like helicopters and tanks that were not built for hundreds of years due to technological limitations of his time. The document emphasizes that da Vinci should be remembered not just as a painter but as an amazing inventor ahead of his time.
This document appears to be from a science quiz containing multiple choice and fill-in-the-blank questions about topics in astronomy, physics, and scientific history. It includes 4 rounds of questions with varying point values for correct or passed answers.
The document appears to be a quiz containing questions about science and history. It includes questions about Arthur C. Clarke and the concept of communication satellites in geostationary orbit being named after him. Another question asks about John Wheeler and his role in popularizing the term "black hole" to describe a completely gravitationally collapsed star. The document also seems to quiz people on scientific concepts like sonoluminescence, Darwin's theory of evolution, and gravitational lensing.
The document summarizes new Chandra and HST observations of the X-ray source IC 10 X-1 located in the nearby galaxy IC 10. The observations confirm that IC 10 X-1 has an average X-ray luminosity of 1.5 × 1038 erg s-1 and is strongly variable. The position of IC 10 X-1, within 0.23 arcseconds, matches the location of the Wolf-Rayet star [MAC92] 17A in IC 10. The observations suggest IC 10 X-1 may be a rare Wolf-Rayet black hole binary system, based on its luminosity, variability, and association with the Wolf-Rayet star.
1) The galaxy merger rate over cosmic time is a fundamental measure of galaxy evolution. Mergers are thought to drive galaxy assembly, rapid star formation, and the formation of spheroidal galaxies and supermassive black holes.
2) While simulations predict that the dark matter halo merger rate increases strongly with redshift, the theoretical predictions for the galaxy merger rate remain uncertain due to the complex relationship between galaxies and dark matter halos.
3) The paper aims to address this problem by calibrating three observational galaxy merger rate estimators - close galaxy pairs, G-M20 morphology, and asymmetry - using hydrodynamic merger simulations. This allows them to determine merger timescales and consistently apply them to observed merger fractions up to
The harps serach_for_southern_exoplanets_02Sérgio Sacani
The document presents an analysis of additional radial velocity measurements of the M dwarf stars Gl 433 and Gl 667C, obtained with the HARPS spectrograph. It finds:
- For Gl 433, one planet (Gl 433b) with a minimum mass of about 5.5 Earth masses and an orbital period of about 7 days. Longer period radial velocity variations are also detected, likely due to magnetic activity cycles.
- For Gl 667C, two planets are found. Gl 667Cb has a minimum mass of about 5.5 Earth masses and an orbital period of about 7 days. Gl 667Cc has a minimum mass of about 4.25 Earth masses and orbits in the habitable zone of its star with a
This document summarizes the results of a 180 ks Chandra-LETGS observation of Mrk 509 as part of a larger multi-wavelength campaign. The observation detected several absorption features in the X-ray spectrum originating from an ionized absorber, including ions with three distinct ionization degrees. The lowest ionized component is slightly redshifted and not in pressure equilibrium with the others, likely belonging to the host galaxy's interstellar medium. The other two components are outflowing at velocities of around -200 and -455 km/s. Simultaneous HST-COS observations detected 13 UV kinematic components, and at least three can be associated with the X-ray components, providing evidence that the UV and X-
The document appears to be a repetition of the same string of characters "1979M&P....21...25G" appearing on multiple lines without any other context. It does not contain enough information to summarize in 3 sentences or less.
This document discusses changes in freshwater pathways in the Arctic Ocean from 2005-2008. Satellite and in situ observations show that freshwater content increased in the Canada basin over this period, balanced by a decrease in the Eurasian basin. This was due to a cyclonic shift in the ocean pathway of Eurasian runoff forced by a strengthening of the west-to-east atmospheric circulation in the Northern Hemisphere, characterized by an increased Arctic Oscillation index. Observations confirm that runoff is an important influence on the Arctic Ocean and that the spatial distribution of freshwater pathways is modulated by the Arctic Oscillation rather than local wind patterns.
- Sundials use the sun's position to tell time and can only be used outdoors during daylight hours without cloud cover. Ancient examples were placed in prominent locations to indicate solstices and equinoxes.
- Stonehenges were used as celestial calendars, burial sites, sacrificial altars, and defensive structures in ancient times.
- Telescopes allow viewing of distant celestial objects like stars, planets, and galaxies. The Hubble Space Telescope is the most advanced telescope currently in use.
- In 1609, Galileo improved upon the recently invented telescope and made several groundbreaking astronomical observations, including mountains on the Moon and moons orbiting Jupiter. He published his findings in 1610, revolutionizing astronomy and challenging Aristotle's geocentric model of the universe.
- Galileo faced backlash from the Catholic Church for his support of the heliocentric Copernican model of the solar system. In 1633, he was tried for heresy, found vehemently suspect of heresy, and spent the rest of his life under house arrest.
- The 400th anniversary of Galileo's first astronomical observations with the telescope is being commemorated in 2009 as the International Year of Astronomy to increase scientific awareness
A Brief History of Light & Photography by Rick DobleRick Doble
This fully illustrated 23 page paper traces the history of photography and our understanding of light from prehistoric times to the present day and also speculates about the future. From Aristotle to Einstein the camera is much older than most realize. Because photography can record fine detail and freeze a moment of the past, it has also transformed our modern understanding of time and also provided a record of the past which was previously unavailable.
"The Armagh Observatory Human Orrey"
Mark Bailey
Presentation of Armagh Observatory outreach initiatives and the Human Orrey. Presented at 2nd UNAWE International Workshop.
(Date: October 2006)
The document provides a timeline of key developments in photography from 470 BCE to present day:
- Camera obscuras were first used in 470-390 BCE to project images onto a screen.
- In the 16th century, camera obscuras were improved by enlarging the hole and adding a lens. In the 17th century, they became portable as sedan chairs.
- The first permanent photograph took 8 hours to develop in 1827 by coating paper with silver chloride.
- Kodak invented the first camera that used film in 1889.
- The first photo of a human was taken in 1838. The first photo of the moon was taken in 1968 by Apollo 8. Modern cameras now use megap
Here is a look inside the book Canada's Stonehenge, the first 40 pages of a 312 page book by Gordon Freeman.
The discovery of a 5000-year-old Sun Temple and an ancient "time machine" - Stone Age calendar - in Canada led scientist Gordon Freeman to ground-breaking discoveries in Stonehenge. During fieldwork and research from 1986 to 2006, Freeman found striking similarities between the surface geometry of the two sites. These similarities push back the boundaries of written history and have far-reaching implications for North American and European history.
Hardcover: 312 pages
Publisher: Kingsley Publishing
Language: English
ISBN-10: 0978452615
ISBN-13: 978-0978452612
actual size of book 24.4 x 17.5 x 3 cm
http://canadastonehenge.com
available through amazon, chapters and quality bookstores in Canada and elsewhere
The document discusses the Hubble Space Telescope, including:
- It was launched in 1990 from the space shuttle Discovery and has received several servicing missions to upgrade its instruments.
- It orbits Earth at an altitude of 340 miles and travels at 27,300 km/h, taking 95 minutes to complete one orbit.
- The telescope is 13.2 meters long and has a maximum diameter, allowing it to take detailed images of space.
Cosmic Search Vol. 1, No. 1Little Green Men, White Dwarfs or Pul.docxvanesaburnand
Cosmic Search Vol. 1, No. 1
Little Green Men, White Dwarfs or Pulsars?
By S. Jocelyn Bell Burnell
"We did all the work ourselves and cheerfully sledgehammered all one summer." Burnell and the antenna.
In all the history of radio astronomy the pulsing signals discovered at Cambridge, England, in 1967 were the most suggestive of an extraterrestrial intelligent origin that have ever been detected. In this article, Jocelyn Bell Burnell tells a delightful, personal story of how she first encountered the signals and what ensued.-Eds.
Ladies and Gentlemen: Before you discover for yourselves let me tell you that I am no expert at after dinner speeches. The nearest I have come was writing a Ph.D. thesis; my supervisor kindly read a draft of it and advised me that it read more like an after-dinner speech than a Cambridge University dissertation. He was right, of course, but it has taken me years to see the funny side of his remark.
There has been a lot of interest shown in the discovery of pulsars, and also some misunderstanding. I would like to take this opportunity of setting the record straight. However, it all happened 8 or 9 years ago, and after such a time there is some difficulty in remembering it all accurately.
The story began in the mid-1960's, when the technique of interplanetary scintillation (IPS) was discovered. IPS is the apparent fluctuation in intensity of the radio emission from a compact radio source. It is due to diffraction of the radio waves as they pass through the turbulent solar wind in interplanetary space. Compact radio sources, e.g. quasars, scintillate more than extended radio sources. Professor Tony Hewish realized this technique would be a useful way of picking out quasars, and designed a large radio telescope to do this. I joined him as a Ph.D. student when construction of this telescope was about to start.
The telescope covered an area of 41/2 acres - an area that would accommodate 57 tennis courts. In this area we put up over a thousand posts, and strung more than 2000 dipoles between them. The whole was connected up by 120 miles of wire and cable. We did the work ourselves - about five of us - with the help of several very keen vacation students who cheerfully sledge-hammered all one summer. It took two years to build and cost about E15,000, which was cheap even then. We started operating it in July 1967, although it was several months more before the construction was completely finished.
I had sole responsibility for operating the telescope and analyzing the data, with supervision from Tony Hewish. We operated it with four beams simultaneously, and scanned all the sky between declinations +50' and -10' once every four days. The output appeared on four 3-track pen recorders, and between them they produced 96 feet of chart paper every day. The charts were analyzed by hand by me. We decided initially not to computerize the output because until we were familiar with the behavior of our telescope and receivers we th.
The document provides a history of the invention and development of telescopes from the early 17th century to modern times. It discusses how Hans Lippershey is generally credited with inventing the refracting telescope in 1608, though others may have contributed. Galileo improved upon the design and was the first to use telescopes to make astronomical observations. Later, James Gregory designed the first reflecting telescope in 1663, and Isaac Newton built the first practical reflecting telescope. Over time, refracting and reflecting telescope designs continued to be improved and developed. Modern telescopes include radio telescopes and space-based telescopes like Hubble.
This document summarizes key events and discoveries in astronomy and paleontology from the 17th century to the early 20th century, including:
- Johannes Hevelius advanced astronomy in the 17th century by accurately describing features of the moon.
- In the 18th-19th centuries, astronomers like Halley, Bradley, and Euler made advances in understanding comets and celestial mechanics.
- In the 19th century, astronomers such as Bessel, Adams, Leverrier, and Galle made discoveries relating to asteroids and the planet Neptune.
- Developments like the spectroscope in the 19th century revolutionized astronomy by allowing the chemical analysis of stars and nebulae.
- In pale
Sir John Herschel was a prominent 19th century British scientist and astronomer who discovered many moons of Saturn and helped develop early photography. In 1835 while in South Africa for astronomical studies, he claimed to have seen fantastical creatures like unicorns, beavers building huts, and spherical amphibians. However, his reports were likely just an elaborate hoax. In 1938, Orson Welles' radio adaptation of The War of the Worlds, broadcast as a series of news bulletins, convinced many listeners that Martians had actually invaded New Jersey, demonstrating the power of media to influence beliefs. Similarly, Ray Santilli in 1995 released grainy film that he claimed showed an alien autopsy in 1947, though
This document provides information about Leonardo da Vinci, notably that he was an Italian polymath born in 1452 in Vinci and lived during the Renaissance. While best known as a painter producing works like the Mona Lisa and The Last Supper, da Vinci was also an inventor, scientist, mathematician and engineer. His conceptual drawings included designs for machines like helicopters and tanks that were not built for hundreds of years due to technological limitations of his time. The document emphasizes that da Vinci should be remembered not just as a painter but as an amazing inventor ahead of his time.
This document appears to be from a science quiz containing multiple choice and fill-in-the-blank questions about topics in astronomy, physics, and scientific history. It includes 4 rounds of questions with varying point values for correct or passed answers.
The document appears to be a quiz containing questions about science and history. It includes questions about Arthur C. Clarke and the concept of communication satellites in geostationary orbit being named after him. Another question asks about John Wheeler and his role in popularizing the term "black hole" to describe a completely gravitationally collapsed star. The document also seems to quiz people on scientific concepts like sonoluminescence, Darwin's theory of evolution, and gravitational lensing.
this is a presentation about invention of telescope. i have placed many information about telescope invention. and ancient world about telescope also. i hope this will usefull to you.
QRIOUS Finals for Relativity, 2019, La Martiniere for BoysRahoulBanerjeeGhosh
This document provides information and rules for a quiz competition called Qurious Finals. It states there are 40 questions worth 10 points each, with a bonus or penalty for answering connect questions correctly or incorrectly. Questions 4, 11, 18, 20, 24, 29, 33, and 37 are connected in a "long connect" related to a specific topic. The document wishes participants good luck.
Here are the 5 Most Powerful Telescopes; 1 -Keck Observatory, began science operations in 1993 2 -Hubble Space Telescope, launched in 1990 3 -Spitzer Space Telescope, launched in 2003 4 -Large Binocular Telescope, first light in October 2005 5 -Fermi Gamma-Ray Space Telescope, launched in 2008
Amar Sharma contacted many veteran comet discoverers for his research on the history of 20th century comet hunting. He has written 550 pages of a book on the passion of amateur astronomy and hopes to complete it soon. He has observed over 60 comets and discovered an Mira variable star while imaging Pluto. Sharma remains dedicated to observing comets and sharing his knowledge of astronomy.
Compositions of iron-meteorite parent bodies constrainthe structure of the pr...Sérgio Sacani
Magmatic iron-meteorite parent bodies are the earliest planetesimals in the Solar System,and they preserve information about conditions and planet-forming processes in thesolar nebula. In this study, we include comprehensive elemental compositions andfractional-crystallization modeling for iron meteorites from the cores of five differenti-ated asteroids from the inner Solar System. Together with previous results of metalliccores from the outer Solar System, we conclude that asteroidal cores from the outerSolar System have smaller sizes, elevated siderophile-element abundances, and simplercrystallization processes than those from the inner Solar System. These differences arerelated to the formation locations of the parent asteroids because the solar protoplane-tary disk varied in redox conditions, elemental distributions, and dynamics at differentheliocentric distances. Using highly siderophile-element data from iron meteorites, wereconstruct the distribution of calcium-aluminum-rich inclusions (CAIs) across theprotoplanetary disk within the first million years of Solar-System history. CAIs, the firstsolids to condense in the Solar System, formed close to the Sun. They were, however,concentrated within the outer disk and depleted within the inner disk. Future modelsof the structure and evolution of the protoplanetary disk should account for this dis-tribution pattern of CAIs.
Signatures of wave erosion in Titan’s coastsSérgio Sacani
The shorelines of Titan’s hydrocarbon seas trace flooded erosional landforms such as river valleys; however, it isunclear whether coastal erosion has subsequently altered these shorelines. Spacecraft observations and theo-retical models suggest that wind may cause waves to form on Titan’s seas, potentially driving coastal erosion,but the observational evidence of waves is indirect, and the processes affecting shoreline evolution on Titanremain unknown. No widely accepted framework exists for using shoreline morphology to quantitatively dis-cern coastal erosion mechanisms, even on Earth, where the dominant mechanisms are known. We combinelandscape evolution models with measurements of shoreline shape on Earth to characterize how differentcoastal erosion mechanisms affect shoreline morphology. Applying this framework to Titan, we find that theshorelines of Titan’s seas are most consistent with flooded landscapes that subsequently have been eroded bywaves, rather than a uniform erosional process or no coastal erosion, particularly if wave growth saturates atfetch lengths of tens of kilometers.
SDSS1335+0728: The awakening of a ∼ 106M⊙ black hole⋆Sérgio Sacani
Context. The early-type galaxy SDSS J133519.91+072807.4 (hereafter SDSS1335+0728), which had exhibited no prior optical variations during the preceding two decades, began showing significant nuclear variability in the Zwicky Transient Facility (ZTF) alert stream from December 2019 (as ZTF19acnskyy). This variability behaviour, coupled with the host-galaxy properties, suggests that SDSS1335+0728 hosts a ∼ 106M⊙ black hole (BH) that is currently in the process of ‘turning on’. Aims. We present a multi-wavelength photometric analysis and spectroscopic follow-up performed with the aim of better understanding the origin of the nuclear variations detected in SDSS1335+0728. Methods. We used archival photometry (from WISE, 2MASS, SDSS, GALEX, eROSITA) and spectroscopic data (from SDSS and LAMOST) to study the state of SDSS1335+0728 prior to December 2019, and new observations from Swift, SOAR/Goodman, VLT/X-shooter, and Keck/LRIS taken after its turn-on to characterise its current state. We analysed the variability of SDSS1335+0728 in the X-ray/UV/optical/mid-infrared range, modelled its spectral energy distribution prior to and after December 2019, and studied the evolution of its UV/optical spectra. Results. From our multi-wavelength photometric analysis, we find that: (a) since 2021, the UV flux (from Swift/UVOT observations) is four times brighter than the flux reported by GALEX in 2004; (b) since June 2022, the mid-infrared flux has risen more than two times, and the W1−W2 WISE colour has become redder; and (c) since February 2024, the source has begun showing X-ray emission. From our spectroscopic follow-up, we see that (i) the narrow emission line ratios are now consistent with a more energetic ionising continuum; (ii) broad emission lines are not detected; and (iii) the [OIII] line increased its flux ∼ 3.6 years after the first ZTF alert, which implies a relatively compact narrow-line-emitting region. Conclusions. We conclude that the variations observed in SDSS1335+0728 could be either explained by a ∼ 106M⊙ AGN that is just turning on or by an exotic tidal disruption event (TDE). If the former is true, SDSS1335+0728 is one of the strongest cases of an AGNobserved in the process of activating. If the latter were found to be the case, it would correspond to the longest and faintest TDE ever observed (or another class of still unknown nuclear transient). Future observations of SDSS1335+0728 are crucial to further understand its behaviour. Key words. galaxies: active– accretion, accretion discs– galaxies: individual: SDSS J133519.91+072807.4
Discovery of An Apparent Red, High-Velocity Type Ia Supernova at 𝐳 = 2.9 wi...Sérgio Sacani
We present the JWST discovery of SN 2023adsy, a transient object located in a host galaxy JADES-GS
+
53.13485
−
27.82088
with a host spectroscopic redshift of
2.903
±
0.007
. The transient was identified in deep James Webb Space Telescope (JWST)/NIRCam imaging from the JWST Advanced Deep Extragalactic Survey (JADES) program. Photometric and spectroscopic followup with NIRCam and NIRSpec, respectively, confirm the redshift and yield UV-NIR light-curve, NIR color, and spectroscopic information all consistent with a Type Ia classification. Despite its classification as a likely SN Ia, SN 2023adsy is both fairly red (
�
(
�
−
�
)
∼
0.9
) despite a host galaxy with low-extinction and has a high Ca II velocity (
19
,
000
±
2
,
000
km/s) compared to the general population of SNe Ia. While these characteristics are consistent with some Ca-rich SNe Ia, particularly SN 2016hnk, SN 2023adsy is intrinsically brighter than the low-
�
Ca-rich population. Although such an object is too red for any low-
�
cosmological sample, we apply a fiducial standardization approach to SN 2023adsy and find that the SN 2023adsy luminosity distance measurement is in excellent agreement (
≲
1
�
) with
Λ
CDM. Therefore unlike low-
�
Ca-rich SNe Ia, SN 2023adsy is standardizable and gives no indication that SN Ia standardized luminosities change significantly with redshift. A larger sample of distant SNe Ia is required to determine if SN Ia population characteristics at high-
�
truly diverge from their low-
�
counterparts, and to confirm that standardized luminosities nevertheless remain constant with redshift.
Evidence of Jet Activity from the Secondary Black Hole in the OJ 287 Binary S...Sérgio Sacani
Wereport the study of a huge optical intraday flare on 2021 November 12 at 2 a.m. UT in the blazar OJ287. In the binary black hole model, it is associated with an impact of the secondary black hole on the accretion disk of the primary. Our multifrequency observing campaign was set up to search for such a signature of the impact based on a prediction made 8 yr earlier. The first I-band results of the flare have already been reported by Kishore et al. (2024). Here we combine these data with our monitoring in the R-band. There is a big change in the R–I spectral index by 1.0 ±0.1 between the normal background and the flare, suggesting a new component of radiation. The polarization variation during the rise of the flare suggests the same. The limits on the source size place it most reasonably in the jet of the secondary BH. We then ask why we have not seen this phenomenon before. We show that OJ287 was never before observed with sufficient sensitivity on the night when the flare should have happened according to the binary model. We also study the probability that this flare is just an oversized example of intraday variability using the Krakow data set of intense monitoring between 2015 and 2023. We find that the occurrence of a flare of this size and rapidity is unlikely. In machine-readable Tables 1 and 2, we give the full orbit-linked historical light curve of OJ287 as well as the dense monitoring sample of Krakow.
Candidate young stellar objects in the S-cluster: Kinematic analysis of a sub...Sérgio Sacani
Context. The observation of several L-band emission sources in the S cluster has led to a rich discussion of their nature. However, a definitive answer to the classification of the dusty objects requires an explanation for the detection of compact Doppler-shifted Brγ emission. The ionized hydrogen in combination with the observation of mid-infrared L-band continuum emission suggests that most of these sources are embedded in a dusty envelope. These embedded sources are part of the S-cluster, and their relationship to the S-stars is still under debate. To date, the question of the origin of these two populations has been vague, although all explanations favor migration processes for the individual cluster members. Aims. This work revisits the S-cluster and its dusty members orbiting the supermassive black hole SgrA* on bound Keplerian orbits from a kinematic perspective. The aim is to explore the Keplerian parameters for patterns that might imply a nonrandom distribution of the sample. Additionally, various analytical aspects are considered to address the nature of the dusty sources. Methods. Based on the photometric analysis, we estimated the individual H−K and K−L colors for the source sample and compared the results to known cluster members. The classification revealed a noticeable contrast between the S-stars and the dusty sources. To fit the flux-density distribution, we utilized the radiative transfer code HYPERION and implemented a young stellar object Class I model. We obtained the position angle from the Keplerian fit results; additionally, we analyzed the distribution of the inclinations and the longitudes of the ascending node. Results. The colors of the dusty sources suggest a stellar nature consistent with the spectral energy distribution in the near and midinfrared domains. Furthermore, the evaporation timescales of dusty and gaseous clumps in the vicinity of SgrA* are much shorter ( 2yr) than the epochs covered by the observations (≈15yr). In addition to the strong evidence for the stellar classification of the D-sources, we also find a clear disk-like pattern following the arrangements of S-stars proposed in the literature. Furthermore, we find a global intrinsic inclination for all dusty sources of 60 ± 20◦, implying a common formation process. Conclusions. The pattern of the dusty sources manifested in the distribution of the position angles, inclinations, and longitudes of the ascending node strongly suggests two different scenarios: the main-sequence stars and the dusty stellar S-cluster sources share a common formation history or migrated with a similar formation channel in the vicinity of SgrA*. Alternatively, the gravitational influence of SgrA* in combination with a massive perturber, such as a putative intermediate mass black hole in the IRS 13 cluster, forces the dusty objects and S-stars to follow a particular orbital arrangement. Key words. stars: black holes– stars: formation– Galaxy: center– galaxies: star formation
JAMES WEBB STUDY THE MASSIVE BLACK HOLE SEEDSSérgio Sacani
The pathway(s) to seeding the massive black holes (MBHs) that exist at the heart of galaxies in the present and distant Universe remains an unsolved problem. Here we categorise, describe and quantitatively discuss the formation pathways of both light and heavy seeds. We emphasise that the most recent computational models suggest that rather than a bimodal-like mass spectrum between light and heavy seeds with light at one end and heavy at the other that instead a continuum exists. Light seeds being more ubiquitous and the heavier seeds becoming less and less abundant due the rarer environmental conditions required for their formation. We therefore examine the different mechanisms that give rise to different seed mass spectrums. We show how and why the mechanisms that produce the heaviest seeds are also among the rarest events in the Universe and are hence extremely unlikely to be the seeds for the vast majority of the MBH population. We quantify, within the limits of the current large uncertainties in the seeding processes, the expected number densities of the seed mass spectrum. We argue that light seeds must be at least 103 to 105 times more numerous than heavy seeds to explain the MBH population as a whole. Based on our current understanding of the seed population this makes heavy seeds (Mseed > 103 M⊙) a significantly more likely pathway given that heavy seeds have an abundance pattern than is close to and likely in excess of 10−4 compared to light seeds. Finally, we examine the current state-of-the-art in numerical calculations and recent observations and plot a path forward for near-future advances in both domains.
Anti-Universe And Emergent Gravity and the Dark UniverseSérgio Sacani
Recent theoretical progress indicates that spacetime and gravity emerge together from the entanglement structure of an underlying microscopic theory. These ideas are best understood in Anti-de Sitter space, where they rely on the area law for entanglement entropy. The extension to de Sitter space requires taking into account the entropy and temperature associated with the cosmological horizon. Using insights from string theory, black hole physics and quantum information theory we argue that the positive dark energy leads to a thermal volume law contribution to the entropy that overtakes the area law precisely at the cosmological horizon. Due to the competition between area and volume law entanglement the microscopic de Sitter states do not thermalise at sub-Hubble scales: they exhibit memory effects in the form of an entropy displacement caused by matter. The emergent laws of gravity contain an additional ‘dark’ gravitational force describing the ‘elastic’ response due to the entropy displacement. We derive an estimate of the strength of this extra force in terms of the baryonic mass, Newton’s constant and the Hubble acceleration scale a0 = cH0, and provide evidence for the fact that this additional ‘dark gravity force’ explains the observed phenomena in galaxies and clusters currently attributed to dark matter.
The binding of cosmological structures by massless topological defectsSérgio Sacani
Assuming spherical symmetry and weak field, it is shown that if one solves the Poisson equation or the Einstein field
equations sourced by a topological defect, i.e. a singularity of a very specific form, the result is a localized gravitational
field capable of driving flat rotation (i.e. Keplerian circular orbits at a constant speed for all radii) of test masses on a thin
spherical shell without any underlying mass. Moreover, a large-scale structure which exploits this solution by assembling
concentrically a number of such topological defects can establish a flat stellar or galactic rotation curve, and can also deflect
light in the same manner as an equipotential (isothermal) sphere. Thus, the need for dark matter or modified gravity theory is
mitigated, at least in part.
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...Sérgio Sacani
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters
represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions
among stars.
Aims. In this paper we present the Extended Westerlund 1 and 2 Open Clusters Survey (EWOCS) project, which aims to investigate
the influence of the starburst environment on the formation of stars and planets, and on the evolution of both low and high mass stars.
The primary targets of this project are Westerlund 1 and 2, the closest supermassive star clusters to the Sun.
Methods. The project is based primarily on recent observations conducted with the Chandra and JWST observatories. Specifically,
the Chandra survey of Westerlund 1 consists of 36 new ACIS-I observations, nearly co-pointed, for a total exposure time of 1 Msec.
Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
and around Westerlund 1. Sources were detected by combining various existing methods, and photon extraction and source validation
were carried out using the ACIS-Extract software.
Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
with 1075 sources located within the central 1 arcmin. We have successfully detected X-ray emissions from 126 out of the 166 known
massive stars of the cluster, and we have collected over 71 000 photons from the magnetar CXO J164710.20-455217.
The debris of the ‘last major merger’ is dynamically youngSérgio Sacani
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Tr...Sérgio Sacani
Recent discoveries of Earth-sized planets transiting nearby M dwarfs have made it possible to characterize the
atmospheres of terrestrial planets via follow-up spectroscopic observations. However, the number of such planets
receiving low insolation is still small, limiting our ability to understand the diversity of the atmospheric
composition and climates of temperate terrestrial planets. We report the discovery of an Earth-sized planet
transiting the nearby (12 pc) inactive M3.0 dwarf Gliese 12 (TOI-6251) with an orbital period (Porb) of 12.76 days.
The planet, Gliese 12 b, was initially identified as a candidate with an ambiguous Porb from TESS data. We
confirmed the transit signal and Porb using ground-based photometry with MuSCAT2 and MuSCAT3, and
validated the planetary nature of the signal using high-resolution images from Gemini/NIRI and Keck/NIRC2 as
well as radial velocity (RV) measurements from the InfraRed Doppler instrument on the Subaru 8.2 m telescope
and from CARMENES on the CAHA 3.5 m telescope. X-ray observations with XMM-Newton showed the host
star is inactive, with an X-ray-to-bolometric luminosity ratio of log 5.7 L L X bol » - . Joint analysis of the light
curves and RV measurements revealed that Gliese 12 b has a radius of 0.96 ± 0.05 R⊕,a3σ mass upper limit of
3.9 M⊕, and an equilibrium temperature of 315 ± 6 K assuming zero albedo. The transmission spectroscopy metric
(TSM) value of Gliese 12 b is close to the TSM values of the TRAPPIST-1 planets, adding Gliese 12 b to the small
list of potentially terrestrial, temperate planets amenable to atmospheric characterization with JWST.
Gliese 12 b, a temperate Earth-sized planet at 12 parsecs discovered with TES...Sérgio Sacani
We report on the discovery of Gliese 12 b, the nearest transiting temperate, Earth-sized planet found to date. Gliese 12 is a
bright (V = 12.6 mag, K = 7.8 mag) metal-poor M4V star only 12.162 ± 0.005 pc away from the Solar system with one of the
lowest stellar activity levels known for M-dwarfs. A planet candidate was detected by TESS based on only 3 transits in sectors
42, 43, and 57, with an ambiguity in the orbital period due to observational gaps. We performed follow-up transit observations
with CHEOPS and ground-based photometry with MINERVA-Australis, SPECULOOS, and Purple Mountain Observatory,
as well as further TESS observations in sector 70. We statistically validate Gliese 12 b as a planet with an orbital period of
12.76144 ± 0.00006 d and a radius of 1.0 ± 0.1 R⊕, resulting in an equilibrium temperature of ∼315 K. Gliese 12 b has excellent
future prospects for precise mass measurement, which may inform how planetary internal structure is affected by the stellar
compositional environment. Gliese 12 b also represents one of the best targets to study whether Earth-like planets orbiting cool
stars can retain their atmospheres, a crucial step to advance our understanding of habitability on Earth and across the galaxy.
The importance of continents, oceans and plate tectonics for the evolution of...Sérgio Sacani
Within the uncertainties of involved astronomical and biological parameters, the Drake Equation
typically predicts that there should be many exoplanets in our galaxy hosting active, communicative
civilizations (ACCs). These optimistic calculations are however not supported by evidence, which is
often referred to as the Fermi Paradox. Here, we elaborate on this long-standing enigma by showing
the importance of planetary tectonic style for biological evolution. We summarize growing evidence
that a prolonged transition from Mesoproterozoic active single lid tectonics (1.6 to 1.0 Ga) to modern
plate tectonics occurred in the Neoproterozoic Era (1.0 to 0.541 Ga), which dramatically accelerated
emergence and evolution of complex species. We further suggest that both continents and oceans
are required for ACCs because early evolution of simple life must happen in water but late evolution
of advanced life capable of creating technology must happen on land. We resolve the Fermi Paradox
(1) by adding two additional terms to the Drake Equation: foc
(the fraction of habitable exoplanets
with significant continents and oceans) and fpt
(the fraction of habitable exoplanets with significant
continents and oceans that have had plate tectonics operating for at least 0.5 Ga); and (2) by
demonstrating that the product of foc
and fpt
is very small (< 0.00003–0.002). We propose that the lack
of evidence for ACCs reflects the scarcity of long-lived plate tectonics and/or continents and oceans on
exoplanets with primitive life.
A Giant Impact Origin for the First Subduction on EarthSérgio Sacani
Hadean zircons provide a potential record of Earth's earliest subduction 4.3 billion years ago. Itremains enigmatic how subduction could be initiated so soon after the presumably Moon‐forming giant impact(MGI). Earlier studies found an increase in Earth's core‐mantle boundary (CMB) temperature due to theaccumulation of the impactor's core, and our recent work shows Earth's lower mantle remains largely solid, withsome of the impactor's mantle potentially surviving as the large low‐shear velocity provinces (LLSVPs). Here,we show that a hot post‐impact CMB drives the initiation of strong mantle plumes that can induce subductioninitiation ∼200 Myr after the MGI. 2D and 3D thermomechanical computations show that a high CMBtemperature is the primary factor triggering early subduction, with enrichment of heat‐producing elements inLLSVPs as another potential factor. The models link the earliest subduction to the MGI with implications forunderstanding the diverse tectonic regimes of rocky planets.
Climate extremes likely to drive land mammal extinction during next supercont...Sérgio Sacani
Mammals have dominated Earth for approximately 55 Myr thanks to their
adaptations and resilience to warming and cooling during the Cenozoic. All
life will eventually perish in a runaway greenhouse once absorbed solar
radiation exceeds the emission of thermal radiation in several billions of
years. However, conditions rendering the Earth naturally inhospitable to
mammals may develop sooner because of long-term processes linked to
plate tectonics (short-term perturbations are not considered here). In
~250 Myr, all continents will converge to form Earth’s next supercontinent,
Pangea Ultima. A natural consequence of the creation and decay of Pangea
Ultima will be extremes in pCO2 due to changes in volcanic rifting and
outgassing. Here we show that increased pCO2, solar energy (F⨀;
approximately +2.5% W m−2 greater than today) and continentality (larger
range in temperatures away from the ocean) lead to increasing warming
hostile to mammalian life. We assess their impact on mammalian
physiological limits (dry bulb, wet bulb and Humidex heat stress indicators)
as well as a planetary habitability index. Given mammals’ continued survival,
predicted background pCO2 levels of 410–816 ppm combined with increased
F⨀ will probably lead to a climate tipping point and their mass extinction.
The results also highlight how global landmass configuration, pCO2 and F⨀
play a critical role in planetary habitability.
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
- Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und überflüssigen Konten
- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
- Tipps für häufige Problembereiche, wie z. B. Team-Postfächer, Funktions-/Testbenutzer usw.
- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
For the full video of this presentation, please visit: https://www.edge-ai-vision.com/2024/06/how-axelera-ai-uses-digital-compute-in-memory-to-deliver-fast-and-energy-efficient-computer-vision-a-presentation-from-axelera-ai/
Bram Verhoef, Head of Machine Learning at Axelera AI, presents the “How Axelera AI Uses Digital Compute-in-memory to Deliver Fast and Energy-efficient Computer Vision” tutorial at the May 2024 Embedded Vision Summit.
As artificial intelligence inference transitions from cloud environments to edge locations, computer vision applications achieve heightened responsiveness, reliability and privacy. This migration, however, introduces the challenge of operating within the stringent confines of resource constraints typical at the edge, including small form factors, low energy budgets and diminished memory and computational capacities. Axelera AI addresses these challenges through an innovative approach of performing digital computations within memory itself. This technique facilitates the realization of high-performance, energy-efficient and cost-effective computer vision capabilities at the thin and thick edge, extending the frontier of what is achievable with current technologies.
In this presentation, Verhoef unveils his company’s pioneering chip technology and demonstrates its capacity to deliver exceptional frames-per-second performance across a range of standard computer vision networks typical of applications in security, surveillance and the industrial sector. This shows that advanced computer vision can be accessible and efficient, even at the very edge of our technological ecosystem.
Northern Engraving | Nameplate Manufacturing Process - 2024Northern Engraving
Manufacturing custom quality metal nameplates and badges involves several standard operations. Processes include sheet prep, lithography, screening, coating, punch press and inspection. All decoration is completed in the flat sheet with adhesive and tooling operations following. The possibilities for creating unique durable nameplates are endless. How will you create your brand identity? We can help!
[OReilly Superstream] Occupy the Space: A grassroots guide to engineering (an...Jason Yip
The typical problem in product engineering is not bad strategy, so much as “no strategy”. This leads to confusion, lack of motivation, and incoherent action. The next time you look for a strategy and find an empty space, instead of waiting for it to be filled, I will show you how to fill it in yourself. If you’re wrong, it forces a correction. If you’re right, it helps create focus. I’ll share how I’ve approached this in the past, both what works and lessons for what didn’t work so well.
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Old cooke
1. Old Cooke; new perspectives
OLD COOKE;
NEW PERSPECTIVES
Can a make of refractor over 150 years old rival the quality of modern optics? Neil English looks at the
experience of a number of accomplished astronomers to discover the legacy of the Cooke refractors,
,,[To] our English Fraunhofer. .. whose science and skill We shall begin with the Reverend eight-inch (203mm) Cooke (that later
had restored to England the pre-eminent position she William Rutter Dawes (1799-1868), became known as the Thorrowgood),
held a century ago in the time of Dollond." revered among double star observers usually with a magnifYing power of
So wrote the mystery obituarist in 1868 concerning for bringing us his empirical formula 258x. His drawings, wrote Richard
the legacy of Thomas Cooke, master optician and used to work out the minimum Anthony Proctor, "are far better
founder ofT Cooke and Sons of York. It was a fitting aperture needed to resolve double stars than any others ... the views by Beer
accolade for a self-made Yorkshireman who had of a given angular separation. What is and Miidler are good, as are some of
re-established the prestige of Britain as great telescope less well known is that the Reverend Secchi's (though they appear badly
builders throughout the Victorian era and beyond. From was also a first rate planetary observer, drawn). Nasmyth's and Phillips', De
humble origins and with little formal training, Cooke apparently possessing extraordinary La Rue's two views are also admirable;
went on to build some of the frnest telescopes of his visual acuity. And he had an interesting and Lockyer has given a better set of
generation, including tlle giant 25-inch (635mm) Newall purchasing history, having used views than any of the others. But there
refractor, which briefly enjoyed the distinction of being refractors crafted by Dollond, Merz is an amount of detail in Mr Dawes'
the largest instrun1ent of its kind in the world. and MaJUer, Cooke and even the views which renders them superior to
Having had the pleasure of looking through a few shining light of An1erican optics, any yet taken." Camille Flammarion
Cooke refractors ranging in size from four inches (102mm) tile portrait painter turned telescope concurred: "The drawings by ...
up to ten inches (254mm), the images they served up never maker, Alvan Clark. Dawes brought a new precision to
failed to impress me. But were my views of the Cooke Yet, in the autumn of his life, old studies of Mars."
refractors 'coloured' or even 'representative' of what other 'Eagle Eyes' returned to a Cooke
observers have found? Curious to find out, I first explored refractor. Dawes had already made Red star delight
some of the comments of historical observers who had used some drawings of Mars in 1862 and at Across the Irish Sea, at a beautiful,
Cooke refractors during the course of their careers. earlier oppositions. In 1864, he used an windswept rural estate near Milltown,
341 Astronomy Now I July 2011
2. Old Cooke; new perspectives
six-inch telescope, and for many eight inches seems to be
the smallest aperture they'd be happy with. The Encke
division (marking) is typically regarded today as a good
target for a ten-inch instrument (for the record, I've
personally not seen it). So, was it the fme optics Raman
had in his five-inch Cooke, or exceptional eyes, or both?
I guess we'll never know for sure!
We return, once again, to England and to the
fondly remembered British actor and comedian WIll
Hay (1888-1949). Though playing the consun1mate
idiot on stage, behind the scenes Hay was a gentleman
of encyclopaedic knowledge, with a predilection for
astronomical adventure. He set up a fine six-inch Cooke
refractor in a private observatory established at his home
in Norbury, London, to study the planets. On the faithful
night of 3 August 1933, Hay used this instrument and an
eyepiece delivering a power of 175 x to detect a prominent
white spot on Saturn. The spot, located in the planet's
equatorial zone, remained prominent for a few days before
mysteriously fading away. Although similar phenomena
were recorded by earlier observers (Asaph Hall in 1877
and E E Barnard in 1903), Hay is credited with the official
discovery. Curiously, Hay's beloved six-inch Cooke, like
the spot he discovered, inexplicably disappeared after his
death and, despite diligent attempts to locate .it, we are still 11'I[i.
none the wiser concerning its current whereabouts! ~:
Modern perceptions
How did these refractors of old settle with folk who have
had the pleasure of using them over years and decades? First,
I contacted Douglas Daniels, President of the Hampstead
Scientific Society, England, who has had the iinmense good
fortune of using the observatory's six-inch £'l5 Cooke since
1967. Doug spoke to me about his background and how he
became acquainted with Cooke refractors.
"I have always been a keen lunar and planetary
observer and telescope maker since I first became seduced
by astronomy at the age of 13 in 1953," he says. "I joined
County Galway, John Birmingham (1814-1884) made ... A portable four- the British Astronomical Association [BAA] in 1956,
use of a 4.5 -inch (114mm) Cooke refractor to embark inch (102mm) fl15 which was the year of a very close opposition of Mars.
on a special study of red stars, in which he wished to Cooke refractor.
circa 1860, fixed At that time, I had built a six-inch Newtonian reflector
undertake a revision and extension of the best resource onto an original using a mirror made by the late Henry Wildey. I was q.,uite
of its day on such objects, Hans Schjellerup's Catalogue Cooke mount. impressed by the performance of this instrument, both on
of Red Stars. In all, he included 658 such objects. This Image: Richard Day.
Mars and Jupiter, but I was soon to meet another young
work was presented to the Royal Irish Academy in 1876 BAA member - Terry Pearce. Terry and I became good
and its merit was acknowledged by the award of the friends (and still are!). Terry had managed to borrow a
Cunningham MedaL In 1881 Birmingham discovered 4.5-inch Cooke from the BAA and had set it up in his
a deep red star in Cygnus, which is named after him. garden at Chingford in Essex. I was amazed at the sheer
He published articles on the transit of Venus and size of it. It was on the usual Cooke, two-part cast iron
sunspot morphology made with the same telescope, column and the equatorial mOlUlt was massive for an
corresponding regularly with the leading astronomers of instrument of that size. But I was even more amazed when
his day. A lunar crater is named in his honour too. I looked through it. The detail on both Mars and Jupiter
Moving next to the Far East, to Bankura in India, was astounding - far more contrast than with my six-inch
Chandrasekhar Venkata Raman (subsequently knighted), reflector. That was my first taste of a Cooke."
the recipient of the 1930 Nobel Prize in Physics for his
contributions to optical science, was fond of using a five-inch
(l27mm) Cooke refractor. I came across one curious account "AMATEURS HAVE BECOME SOMEWHAT
Raman made whilst using this telescope to observe Saturn: OBSESSED WITH OPTICAL QUALITY AND
" ... not only was the Crepe ring an easy object," he
BENCH TESTING, YET THESE ANTIQUATED
says, "But for nearly one hour while tl1e definition was
perfect, I made out Encke's marking in the A-ring and TELESCOPES CLEARLY HAVE THE POWER TO
held it steadily for practically the whole period." DELIVER THE READIES"
Now the Crepe ring is quite a difficult target for a
3. --- _- _- _- .._-- _- _-- _- _- _- _- - _-- -
I asked Doug how and when he first became
acquainted with the Hampstead six-inch Cooke.
"In 1967 I joined the Hampstead Scientific
Society and was able to use the six-inch Cooke at the
Hampstead Observatory," he says. "Again, 1967 was
a year with a good opposition of Mars, and the detail
observed with the Cooke was so good that I began
to attempt photography. I built a special planetary
camera with a flip mirror system to keep the planet
under close surveillance waiting for clear moments to
make exposures - it was a sort of single lens reflex job
but without the lens! [remember, this was 1967!]. My
photographs came to the attention of an American
student called Ron Wells, who was doing a PhD on
Martian topography at University College London. Ron
was working at the University of London Observatory
at Mill Hill - just 15 minutes from my-home. I was
introduced to the Director, Professor Allen, and was
allowed to use the 18-inch (457mm) Grubb - I had the
key to the big dome for six months. On the same site,
there were two smaller domes. One contained the Fry
Telescope - an eight-inch Cooke. Once again the Cooke
was the instrument that impressed most. On most nights
of average seeing, it could easily outperform the 18-inch
• Some of Doug Daniel's Grubb. Only when the seeing was excellent could the
recorded detail of the Martian Grubb show slightly more detail."
opposition of 1967. Image: Doug was more than happy to recount the
Doug Daniels.
telescope's long history.
"The Cooke was once owned by a member
called George Avenell," Doug says. "We know that
it was in use at the observatory in 1923. It was finally
presented to the society in 1928. Prior to this we have
no information. The optical tube appears to have
been manufactured around 1900, but we have no hard
evidence for this date. When I began using it in 1967,
it was mounted on an old Cooke equatorial from a
4.5-inch instrument that was too small. It had the old
Cooke falling weight drive and a worm sector, not a
complete wheel that was always getting jammed. In
the end we built our own heavy-duty mount in 1976,
driven by a stepper motor. A couple of years ago, I was
in correspondence with Martin Mobberley, who was
researching the six-inch Cooke once owned by Will
!l./.ool..,
Hay. I was able to confirm that the Hampstead Cooke
'-;,.J.. O·Q ,.,._ ~ )( 3
was not Hay's instrument."
F.P. 3 e~E.t Sec..
What about the telescope's maintenance? Is it, in
"'.."..J~ ~o "";"'s ....Q f'I>du",.
any sense, fastidious in its requirements? "Not at all,"
says Doug. "The objective is best left well alone. It gets
an annual wipe over with meths and a lint free cloth and
every few years is checked for squaring on, which hardly
'lS/4/Q needs any adjustment for long time periods. That's
t>1I."'''''"<j .. pl,()fO<j"fh another nice aspect of refractors - they are virtually
t4..... S<......... Q'4Si.", maintenance free, unlike reflectors which are constantly
~h."
0 ....
~1.1<:l going out of square and need re-coating every few years."
~~ "l.J. IS· "~I() b...J.O.q..
Ph"'" t 10<. ." fP· -S f'.I'~l A new eye on an old telescope
~cN"'" 'l5-~~
De ... f'l!Q
Next I canvassed the opinion of Dr Richard McKim,
Director of the Mars Section of the BAA, who has
used Cooke refractors in his extensive studies of the
red planet over the last few decades. "I have used many
refractors on a regular basis since the 1970s," explains
McKim. "The problem is, I have no basis of comparison
with other makes. Until 1988, the Northumberland
..................................... - - - -- - ..-..--- ..- - - - ~