Threats To Earth Part1 And 2
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Asteroids are large rocks left over from the formation of the solar system that are mostly located between the orbits of Mars and Jupiter. Asteroids have collided with Earth in the past, forming large craters and ejecting dust and rocks that blocked sunlight and caused climate change and species extinction, including dinosaurs. Comets are balls of rock and ice that speed up as they approach the sun due to its increasing gravitational pull. Near-Earth objects like asteroids and comets can be detected early using telescopes to observe their trajectories and potentially alter their course if they are on a collision path with Earth.
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The document discusses the solar system from a broader perspective. It provides details on the formation of the solar system based on the nebular hypothesis, including how planets formed from a rotating cloud of gas and dust. It also describes the different types of objects in the solar system such as the terrestrial and gas planets, asteroids, comets, and Pluto. Additionally, it discusses theories for the origin of the Moon and evidence that Mars once had liquid water on its surface.
cometsasteriodsandmeteors-151126140358-lva1-app6892.pdf
Recent advances in space technology have allowed scientists from different backgrounds to collaborate on studying Near-Earth Objects like comets and asteroids. Studies of these objects provide clues about the origins of the solar system. Several asteroids have been discovered to come close to Earth in recent years, including Asteroid 2012 DA14 in February 2012. Impacts from asteroids and comets have significantly affected Earth in the past, including possibly causing the extinction of dinosaurs 65 million years ago. On average, objects large enough for an impact are estimated to hit Earth once every 100,000 years or so, with smaller objects hitting more frequently.
Comets, meteors, and asteroids
Comets, meteors, and asteroids are objects that orbit the sun. Comets are small icy bodies that develop tails as they heat up when passing near the sun. Meteors are small particles that burn up as they enter the Earth's atmosphere, sometimes forming meteor showers. Asteroids are rocky remnants from the early solar system and orbit mostly in the asteroid belt between Mars and Jupiter. The moon affects the Earth by providing light at night and influencing ocean tides through its gravitational pull.
Comets, meteors, and asteroids
This document provides information about comets, meteors, and asteroids. It states that comets are small icy masses that orbit the sun and have orbital periods ranging from years to centuries. Meteors are smaller than comets and are made of dust, with meteor showers occurring when cosmic debris enters the atmosphere. Asteroids are rocky remnants from the formation of the solar system and orbit mainly in the asteroid belt between Mars and Jupiter, ranging in size from hundreds of feet to hundreds of miles.
Comets, meteors, and asteroids
This document provides information about comets, meteors, and asteroids. It states that comets are small icy masses that orbit the sun and have orbital periods ranging from years to centuries. Meteors are smaller than comets and are made of dust, with meteor showers occurring when cosmic debris enters the atmosphere. Asteroids are rocky remnants from the formation of the solar system and orbit mainly in the asteroid belt between Mars and Jupiter, ranging in size from hundreds of feet to hundreds of miles.
Comets, meteors, and asteroids
Comets, meteors, and asteroids are objects that orbit the sun. Comets are small icy bodies that develop tails as they heat up when passing near the sun. Meteors are small particles that burn up upon entering Earth's atmosphere, sometimes forming meteor showers. Asteroids are rocky remnants from the early solar system and orbit mostly in the asteroid belt between Mars and Jupiter, ranging in size from hundreds of feet to hundreds of miles wide. The moon affects tides and lunar phases on Earth due to its gravitational pull and position relative to the sun.
Asteroids:
Asteroids are small rocky objects that orbit the sun. They range in size from hundreds of miles to just a few feet wide, and there are millions of them. While small, asteroids can be dangerous if they collide with Earth. Scientists study asteroids to learn more about their numbers, orbits, and characteristics in order to detect any that may pose a threat. Asteroids are remnants from the early formation of the solar system and continue to provide insights into how the system evolved over billions of years.
COMETS, METEOR, ASTEROIDS PPT.pptx
This document provides information about comets, asteroids, and meteoroids/meteors/meteorites. It defines each term and discusses their characteristics. Comets are dirty snowballs composed of ice and dust that form long tails when near the Sun. Asteroids orbit between Mars and Jupiter and are pieces of leftover rock from planet formation. Meteoroids are space rocks, meteors are meteoroids that burn up in the atmosphere, and meteorites are meteoroids that reach the Earth's surface. The document seeks to clarify the differences between these similar yet distinct objects in our solar system.
Asteroids, comets, meteors, and moons
Comets are small cosmic bodies composed of rock, dust, ice and frozen gases that orbit the sun in elongated orbits. They develop tails and comas as solar radiation causes particles to dissipate from the comet as they approach the sun. Asteroids are small rocky bodies that orbit the sun and are remnants of larger planetesimals. Meteoroids are smaller particles that orbit the sun and create visible meteors when entering Earth's atmosphere due to pressure.
UNIT 2 ASTRONOMY.pptx
This document provides an overview of key concepts in astronomy to be covered in Unit 2. It discusses scaling in the universe from solar systems to galaxies to the observable universe. It describes the Milky Way galaxy and theories of the formation and age of the universe based on evidence from the Big Bang like cosmic background radiation and redshift. It also summarizes formation of the solar system, properties of planets and other celestial objects, fusion in stars, phases of the moon, tides, and types of eclipses.
The Fifth Planet I
The document discusses evidence that asteroids, comets, and dwarf planets originated from a planet called Astra that was destroyed billions of years ago. Data from the Rosetta mission showed that Comet 67P resembled material from Earth's oceans, supporting the theory that it originated from Astra's oceans. Images of asteroids revealed some have spherical shapes, likely from molten rock ejected during Astra's destruction. The document argues this new data contradicts older theories and supports Astra being shattered to form the asteroids and comets we observe today.
Physics Of The Solar System
In our solar system, the differences between planets and other objects mostly occur because of their formation at the birth of our solar system. Although it is very difficult to tell, most scientists believe that our solar system formed from a small chunk of an interstellar gas cloud. If true, the composition of the gas cloud would have caused the composition of our sun as well as that of other objects in our solar system. Once the sun formed, that influenced the formation of the planets. Since it was much warmer closer to the sun, only denser, metallic elements were able to condense. This warmer region is now home to the terrestrial planets, which include Mercury, Venus, Earth, and Mars.
Asteroid meteorcomets
The document discusses asteroids, comets, and Pluto. It explains that asteroids formed from leftover material from planet formation and are found mainly in the asteroid belt between Mars and Jupiter due to Jupiter's gravitational influence. Comets formed beyond the frost line and have icy compositions; their tails form when they near the Sun and ice sublimates. Most comets originate from the Kuiper Belt and Oort Cloud. Pluto has properties matching Kuiper Belt objects. An impact likely caused the mass extinction that killed the dinosaurs. While impacts pose a real threat, the likelihood of a major impact within our lifetimes is low. Other planets can affect Earth's impact rates through their gravitational influence on small solar system bodies.
Final Project
This document contains information about meteors, meteorites, asteroids, and comets. It defines these terms and describes their differences. Meteoroids become meteors when entering Earth's atmosphere, and meteorites are meteors that survive impact with Earth's surface. Asteroids orbit the sun mainly between Mars and Jupiter. Comets have highly elliptical orbits and develop tails as they approach the sun due to sublimating ice. The document provides examples of meteor showers and observed fireballs.
FINAL project
1) The document discusses various celestial objects that orbit the sun including meteors, meteorites, asteroids, and comets. It provides definitions and descriptions of each object.
2) Key differences are outlined, such as meteoroids become meteors when entering the earth's atmosphere, and meteorites are meteors that survive impact and land on earth. Asteroids orbit mainly between Mars and Jupiter, while comets have more elliptical orbits and tails when near the sun.
3) Examples of significant meteors, asteroids, and comets are mentioned, including Comet Hale-Bopp which was exceptionally large and the longest observed comet.
Phys320_Lecture21.pptx
This document discusses meteor showers, asteroids, and comets. It notes that meteor showers occur yearly as Earth passes through debris from comets. It describes gaps in the distribution of asteroids called Kirkwood gaps, which are caused by resonances with Jupiter. It discusses evidence that asteroid families originated from collisions of larger parent bodies. The document also summarizes spacecraft visits to asteroids and comets, the different tails of comets, and forces like radiation pressure that affect small particles in the Solar System.
Our universe as a whole
The document discusses the major components of the universe including galaxies, stars, planets, comets and asteroids. It describes the formation of the universe through the Big Bang theory and provides details on key astronomical objects like nebulae, supernovae and constellations. Furthermore, it outlines our solar system and important facts about bodies like the sun, Earth and dwarf planets. The document also covers China's plans to develop an artificial moon and sun through nuclear fusion experiments.
KS4 Earth and Beyond.ppt
The document provides information about the solar system and universe, including:
1. It describes the lifecycles of stars from nebulae to red giants, white dwarfs, neutron stars, and black holes.
2. It explains that the Sun is powered by nuclear fusion, fusing hydrogen into helium, and will eventually expand into a red giant and shed its outer layers.
3. It discusses theories about the origin and fate of the universe, including the Big Bang theory and steady state theory, and notes evidence like the cosmic microwave background radiation.
The Universe and the Stars
This document provides a summary of key concepts in astronomy, including the universe, galaxies, stars, planets in our solar system, and important historical astronomers like Ptolemy, Copernicus, and Galileo. It describes how stars are born from nebulae and die, as well as concepts like nuclear fusion, main sequence, and how our sun will eventually die. Important terms are defined like nebulae, constellations, blue giants, and red dwarfs. Historical figures that advanced our understanding of astronomy are also summarized.
comets and asteroidssssssssssssssssspptx
This document provides information about comets, asteroids, and meteors. It defines each term, describes their characteristics and locations in the solar system. Comets are icy bodies that develop tails as they near the sun, while asteroids are rocky fragments left over from the solar system's formation. Meteoroids enter the earth's atmosphere and become meteors, with larger ones surviving as meteorites. The document also includes a quiz to test comprehension.
Similar to Threats To Earth Part1 And 2 (20)
cometsasteriodsandmeteors-151126140358-lva1-app6892.pdf
cometsasteriodsandmeteors-151126140358-lva1-app6892.pdf
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Chilren All Over The World
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This document provides a list of book titles and activities related to getting dressed. It includes the book titles "You'll Soon Grow Into Them, Titch", "Froggy Gets Dressed", "Mrs. McNosh Hangs Up Her Wash", "Stop Those Pants!", and "Something from Nothing". The document also lists the fingerplay "This is my cap" which acts out putting on different headwear.
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Threats To Earth Part1 And 2
- 1. Threats to Earth P2g part 1 & 2
- 4. The asteroid Gaspra, found in the Asteroid Belt between Mars & Jupiter
- 5. Asteroid Ida with it’s moon Dactyl
- 8. Asteroids are small ______________ which orbit the ______________, mainly between ______________ and ______________. Occasionally, a long time ago, ______________ are thought to have struck ______________, forming large ______________ and huge amounts of ______________ and ______________ vapour. An enormous asteroid is believed to have hit ______________ 65 ______________ years ago, leading to the ______________ of the ______________. ______________ could not penetrate the ______________ so ______________ fell, causing ______________ change. Asteroids atmosphere climate comets craters dinosaurs dust Earth extinction Jupiter Mars meteors million Neptune rocks Saturn snowballs Sun sunlight temperatures water Rocks Sun Mars Jupiter Asteroids Earth craters dust water Earth million extinction dinosaurs sunlight atmosphere temperatures climate
- 12. Halley’s Comet Reappears every 76 years Image from 1986
- 13. Hale-Bopp as seen from Craig County, VA in 1997
- 14. Hale-Bopp as seen from Alexandria, VA in 1997
- 15. Hale-Bopp as seen from Wyoming in 1997