This document provides a history and overview of black holes. It discusses that the idea of black holes was first proposed by John Mitchell in the 18th century. Key developments include Einstein's theory of relativity in 1915 and the work of Israel, Carter and Robinson establishing the no-hair theorem in the 1970s. The term "black hole" was first publicly used by John Wheeler and first recorded in an article by Ann Ewing. The document then covers the classification, features and examples of different types of black holes such as their event horizons, singularities, photon spheres, and ergospheres. Black holes can be supermassive, stellar-mass or hypothetical micro black holes. They are also classified based on their properties as
Hey I'm DIVYA SHREE NANDINI. I'm here with my new presentation on Black Hole. I'm sure you'll find it interesting. well first thing what is black hole- "Black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape. A black hole can be formed by the death of a massive star. When such a star has exhausted the internal thermonuclear fuels in its core at the end of its life, the core becomes unstable and gravitationally collapses inward upon itself, and the star’s outer layers are blown away. The crushing weight of constituent matter falling in from all sides compresses the dying star to a point of zero volume and infinite density called the singularity." wanna know more about it then come with me. :)
Hey I'm DIVYA SHREE NANDINI. I'm here with my new presentation on Black Hole. I'm sure you'll find it interesting. well first thing what is black hole- "Black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape. A black hole can be formed by the death of a massive star. When such a star has exhausted the internal thermonuclear fuels in its core at the end of its life, the core becomes unstable and gravitationally collapses inward upon itself, and the star’s outer layers are blown away. The crushing weight of constituent matter falling in from all sides compresses the dying star to a point of zero volume and infinite density called the singularity." wanna know more about it then come with me. :)
"Black holes are where God divided by zero" - Albert Einstein
Black hole – A region in the space where the gravitational pull is so strong that neither substance nor light can leave this area.
This is a presentation on Black Holes.
This covers following data about Black Hole->
>>What is Black Hole.
>>History.
>>Parts of Black Hole.
>>Classification.
>>Closest Black Hole.
>>Largest Black Hole.
A presentation I gave to the Brighton Astronomy Society in Jan 2016 - http://brightonastro.com/ , https://www.facebook.com/brightonastro/
Annoyingly that's removed the videos from the slides, so here are links to those:
https://www.youtube.com/watch?v=e-P5IFTqB98&t=18s
(This Youtube channel "In a nutshell" is absolutely fantastic by the way and I highly recommend a look through their other videos!)
https://www.youtube.com/watch?v=duoHtJpo4GY
https://vimeo.com/8723702
I've also made my notes from preparing the slides available here as well:
https://docs.google.com/document/d/1gqgsAbvoCB_7-_gPToqOuSixc02YnU-ajf-uT60R1vc/edit?usp=sharing
-- there are LOTS of further links to interesting videos in there as well, that I didn't use on the night so worth a scan through.
Any further questions, feel free to ask in comments on here
It is said that fact is sometimes stranger than fiction, and nowhere is this more true than in the case of black holes. Black holes are stranger than anything dreamt up by science fiction writers, but they are firmly matters of science ~fact.
Detail about Black holes. It's definition, components and then history of black hole and General theory of relativity.
Life cycle of a star and formation of black hole in space.
Different types of choice after star's life end.
Different types of Black hole on basis on mass of Parent star. and classification of black holes on basis of charge and rotational motion of black holes. Quantum theory of physics.
Study of Black holes using Quantum mechanics by Steaphen Hawking.
Current research on black holes.
search on NASA site also go through the latest news related to black holes before presenting your seminar.
many queries are asked related to black holes.
present the astronomical data's for Good delivery of seminar.In the 18th century John Michell and Pierre-Simon Laplace first mentioned about the objects with a huge gravitation, from which even light cannot escape.
In 1915 Albert Einstein developed the theory of general relativity.
Karl Schwarzschild finds black holes as a solution to Einstein’s equations (1916)
Robert Oppenheimer and Hartland Snyder predict that massive stars can collapse into black holes (1939)
A black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull.”
Black holes are exotic structures whose gravitational fields are so powerful that they trap everything, even light. They were first postulated by Albert Einstein's theory of general relativity.”
This can happen when a star is dying.
Though they are black they are invisible to us.
The density of a black hole is so great it would be like taking the whole Earth and crushing into a volume smaller than a 1” marble!.
Stellar-mass: 3 to 20 times the mass of our Sun
Supermassive: Black holes with millions to billions of times the mass of our Sun
Mid-mass: In between stellar-mass and supermassive.
"Black holes are where God divided by zero" - Albert Einstein
Black hole – A region in the space where the gravitational pull is so strong that neither substance nor light can leave this area.
This is a presentation on Black Holes.
This covers following data about Black Hole->
>>What is Black Hole.
>>History.
>>Parts of Black Hole.
>>Classification.
>>Closest Black Hole.
>>Largest Black Hole.
A presentation I gave to the Brighton Astronomy Society in Jan 2016 - http://brightonastro.com/ , https://www.facebook.com/brightonastro/
Annoyingly that's removed the videos from the slides, so here are links to those:
https://www.youtube.com/watch?v=e-P5IFTqB98&t=18s
(This Youtube channel "In a nutshell" is absolutely fantastic by the way and I highly recommend a look through their other videos!)
https://www.youtube.com/watch?v=duoHtJpo4GY
https://vimeo.com/8723702
I've also made my notes from preparing the slides available here as well:
https://docs.google.com/document/d/1gqgsAbvoCB_7-_gPToqOuSixc02YnU-ajf-uT60R1vc/edit?usp=sharing
-- there are LOTS of further links to interesting videos in there as well, that I didn't use on the night so worth a scan through.
Any further questions, feel free to ask in comments on here
It is said that fact is sometimes stranger than fiction, and nowhere is this more true than in the case of black holes. Black holes are stranger than anything dreamt up by science fiction writers, but they are firmly matters of science ~fact.
Detail about Black holes. It's definition, components and then history of black hole and General theory of relativity.
Life cycle of a star and formation of black hole in space.
Different types of choice after star's life end.
Different types of Black hole on basis on mass of Parent star. and classification of black holes on basis of charge and rotational motion of black holes. Quantum theory of physics.
Study of Black holes using Quantum mechanics by Steaphen Hawking.
Current research on black holes.
search on NASA site also go through the latest news related to black holes before presenting your seminar.
many queries are asked related to black holes.
present the astronomical data's for Good delivery of seminar.In the 18th century John Michell and Pierre-Simon Laplace first mentioned about the objects with a huge gravitation, from which even light cannot escape.
In 1915 Albert Einstein developed the theory of general relativity.
Karl Schwarzschild finds black holes as a solution to Einstein’s equations (1916)
Robert Oppenheimer and Hartland Snyder predict that massive stars can collapse into black holes (1939)
A black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull.”
Black holes are exotic structures whose gravitational fields are so powerful that they trap everything, even light. They were first postulated by Albert Einstein's theory of general relativity.”
This can happen when a star is dying.
Though they are black they are invisible to us.
The density of a black hole is so great it would be like taking the whole Earth and crushing into a volume smaller than a 1” marble!.
Stellar-mass: 3 to 20 times the mass of our Sun
Supermassive: Black holes with millions to billions of times the mass of our Sun
Mid-mass: In between stellar-mass and supermassive.
A false memory is a fabricated or distorted recollection of an event.
People often think of memory as something like a video recorder, accurately documenting and storing everything that happens with perfect accuracy and clarity.
In reality, memory is very prone to fallacy and fragile.
We are susceptible to errors, and subtle suggestions can trigger false memories.
Surprisingly, people with exceptional memories are still susceptible to making things up without even realizing it
People can feel completely confident that their memory is accurate, but this confidence is no guarantee that a particular memory is correct.
I am Nihal Jani from ahmedabad, studying in Sakar English School, and I found that there are no nice ppt's on this interesting topic, so I made one and shared it.
Black holes are the most mysterious objects in the Universe. Black holes are huge hungry monsters which even devours light. Yes, even light cannot escape the black hole.
Journey Through the Cosmos: Exploring Black Holes & Dr. Stephen Hawking's Leg...TUHIN SAHA
Title: Journey Through the Cosmos: Exploring Black Holes & Dr. Stephen Hawking's Legacy
Embark on a captivating journey through the depths of space and the brilliant mind of one of history's most renowned scientists, Dr. Stephen Hawking. In this enlightening presentation, we delve into the enigmatic phenomenon of Black Holes, their mysterious nature, and the groundbreaking discoveries that have shaped our understanding of the universe.
Unlock the secrets of these celestial wonders as we explore topics such as the fundamental question: What is a Black Hole? Delve into the gripping tale of their discovery and unravel the intricate process of their formation. From the mind-bending structure of Black Holes to the various types that exist across the cosmos, each slide unveils a new layer of cosmic intrigue.
But what happens if someone were to venture too close, falling into the gravitational abyss of a Black Hole? Discover the scientific speculation and theories that surround this captivating scenario, offering insight into the ultimate fate of such an intrepid explorer.
Moreover, journey through the extraordinary life and groundbreaking research of Dr. Stephen Hawking, a visionary whose contributions to theoretical physics revolutionized our understanding of the cosmos. Explore the trials and triumphs of his remarkable journey, from his early years to his groundbreaking work on Black Holes and beyond.
1. HISTORY OF BLACK HOLES
•
•
•
•
•
•
Geologist John Mitchell put forward the
idea of a body so massive that even light
could not escape.
1915 Einstein develops his theory of relativity
The Golden Age of relativity
General relativity
Becoming mainstream
started
Black holes
subjects of research
• Israel, Carter and Robinson Noair Theorem
• 1970s, Hawking other scientists formulation of black holes
thermodynamics.
2. HISTORY OF BLACK HOLES
• This analogy, was finished by Hawking in 1974
• The term black hole:
•
- 1st publicly used by John Wheeler
•
- 1st recorded use of term by Ann Ewing in her article “Black Holes in
space”
5. CLASSIFICATION
Black holes are commonly classified according to their mass. The size of a
black hole is proportional to the mass M:
rsh is the Schwarzschild radius and MSun is the mass of the Sun.
6. EVENT HORIZON
Event horizon: is a boundary in space-time through which matter
and light can only pass towards the mass of the black hole. Nothing
can escape from inside the event horizon. The event horizon is
referred to as like this because if an event occurs in the boundary,
information from this event can´t be observed or studied so it is
impossible to know if this event has occurred.
Gravitational time dilation: “clocks near a black hole appear to tick
more slowly than those further away from the black hole.” An
object falling into a black hole appears to slow down as it
approaches the event horizon, taking an infinite time to reach it.
The shape of the event horizon of a black hole is approximately
spherical. For non-rotating (static) black holes the geometry is
spherical, while for rotating black holes the sphere is oblate.
7. SINGULARITY
Gravitational singularity: region where the space-time curvature becomes
infinite. It has zero volume, contains all the mass of the black hole solution and it
has infinitive density.
8. PHOTON SPHERE
The photon sphere: spherical boundary without thickness. For non-rotating
black holes, the photon sphere has a radius 1.5 times the Schwarzschild
radius. While light can still escape from inside the photon sphere, any light
that crosses the photon sphere on an inbound trajectory will be captured by
the black hole. Other objects such as neutron stars, can also have photon
spheres. Any object that is smaller than 1.5 times the Schwarzschild radius
corresponding to its mass will indeed have a photon sphere.
9. ERGOSPHERE
The ergosphere: oblate spheroid region outside of the event horizon, where
objects cannot remain stationary.
Objects and radiation can escape normally from the ergosphere. Through the
Penrose process, objects can emerge from the ergosphere with more energy than
they entered. This energy is taken from the rotational energy of the black hole
causing it to slow down.
10. Depending on the mass black holes can
be:
Supermasive black holes : They are those who have masses of several million
solar masses. They are at the heart of many galaxies . Are formed in the same
process that gives rise to spherical components of galaxies.
Stellar-mass black holes : They are formed when a star of mass 2.5 times that
of the Sun goes supernova and explodes. Its nucleus is concentrated in a very
small volume is reduced whenever more . This is the type of black hole for the
first time goes into the theory of general relativity.
Micro black holes : They are hypothetical objects , somewhat smaller than
stellar . If they are small enough, they can get to evaporate in a relatively
short period through emission of Hawking radiation . This type of physical
entities is postulated in some approaches to quantum gravity, but can not be
generated by a conventional process of gravitational collapse , which requires
higher mass to the Sun
12. Depending on their physical
properties black holes can be:
To classify this black holes we follow Einstein research bout black holes so
black holes are:
The simplest possible black hole is, it has not broken or charge
Schwarzschild black hole.
- If not rotate but has electric charge, there is the black hole called
Reissner-Nordstrøm.
- A rotating black hole without charge is a Kerr black hole.
- If also has charge, talk about a black hole Kerr-Newman.