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Transcript of BLACK HOLES!
- Stephen Hawking BLACK HOLES Black Holes... What are they? How do they form? - Some scientist believe that black holes formed when the universe began.
- Research shows that black holes form when any object reaches a certain critical density & it's gravity causes it to collapse to an almost infinitely small pinpoint. How big are black holes? Stellar Black Holes
“There ought to be something very special about the boundary conditions of the universe and what can be more special than that there is no boundary?” ~ Stephen Hawking
Tselote Holley Black Holes
- A black hole is an invisible space where gravity pulls every last bit of light and matter into a tiny space; nothing can get out. This can happen when a star is dying.
- Because there is no light wherever a black hole is, black holes are invisible to the human eye.
-We know they exist because of telescopes with special tools. These tools study how stars near a black hole are different than other stars that are away from the black holes. - A black hole can be big or small depending on the type of black hole.
- Scientist believe that some black holes can be as big as an atom.
- Those black holes are tiny but have the mass of a large mountain.
- Stellar black holes are stars with 20 times the mass of the sun; who have reached the end of it's life.
- The star loses energy and the repulsing forces equal out the forces of gravity that are pushing against the star.
- When the star goes through singularity, it means the star was crushed and compacted into a single small mass of density.
Singularities are thought to contain infinite amount of density. Though, the requirements are strict, the major requirement being mass.
( The next slide is examples of Stellar Black Holes ) citaions: www.outerspaceuniverse.org , www.spacetelescope.org , www.dailymail.co.uk They are similar to Stellar Black Holes, though there size is a noticeable difference. Miniature black holes citaion: www.space.com THANKS FOR LISTENING! Miniature Black Holes Cont. - Miniature black holes have not been precisely identified but a number of hypothesis have been proposed.
- The "basic idea" is that mini black holes might have been formed shortly after the big bang. Supermassive Black Holes - Supermassive black holes likely exist in the centers of most galaxies, including our own galaxy, the Milky Way.
- If you measure the velocity of stars orbiting the galaxy you can infer the presence of supermassive black holes & calculate its mass. Frequently asked Questions How is time changed in a black hole?
- It is not changed at all. If you were to enter a black hole you would feel as if time was normal but in reality its warped.
- However, you would quickly fall toward the center where you would be killed by enormous tidal forces. How big can a black hole get? - There is no limit to how large a black hole can be.
*Only stars with very large masses can become black holes. Gravitational Pull - A black hole has the same gravitational pull as an ordinary star, however a black hole doesn't really have a "radius"
- Meaning if you got closer to a star, gravity would weaken. Getting closer to a black hole would increase in gravity because of its invisible "radius". Physics Relation - When the body is outside of the gravitational pull, its kinetic energy will be 0 so the equation would be :
1/2 mass(speed^2) = GMm/r Reference - http://amazing-space.stsci.edu/resources/explorations/blackholes/teacher/sciencebackground.html
http://astronomy.swin.edu.au/cosmos/S/Schwarzschild+Radius Swartzchild Radius The Scwartzchild radius is the radius of the event horizon.
Any object with a radius smaller than a schwartzchild radius will be a black hole. Reference - www.space.com/261-twisted-physics-black-holes-spout.html. - http://www.space.com/15421-black-holes-facts-formation-discovery-sdcmp.html - http://www.littlespikeyland.com/blackhole/ http://jsfiddle.net/John1/Z27xj/73/