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Black Holes

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B. von K.

on 1 July 2013

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Transcript of Black Holes

Black holes can "eat" stars
The Milky Way
Stephen Hawking
Right in the centre of the Milky Way, 26,000 light years from us, lies the heaviest object in the galaxy. It is a supermassive black hole containing the mass of four million suns crushed down into a single point by its own gravity. The closer you get to the black hole, the stronger the gravity. Get really close and not even light can escape. A black hole like this one has a dramatic effect on time, slowing it down far more than anything else in the galaxy. That makes it a natural time machine.
A black hole is a place in space where gravity pulls so much that even light can not get out
What is a black hole?
No,they are invisible,because no light can get out from them. Space telescopes with special tools can help us to find black holes. These special tools can see how stars that are very close to black holes behave differently from other stars.
Can they be seen?
Black holes can be very big or very small.
Although they can be as small as an atom,they have the matter of a large mountain.
The largest black holes are called "supermassive." These black holes have masses that are more than 1 million suns together. Scientists have found proof that every large galaxy contains a supermassive black hole at its center.
Big and small black holes
Scientific evidence shows that in the middle of the Milky Way is a supermassive black hole.
Stephen William Hawking,(born 8 January 1942) is a British theoretical physicist, cosmologist, and author.
In one of his conferences he said:
"Through the wormhole, the scientist can see himself as he was one minute ago. But what if our scientist uses the wormhole to shoot his earlier self? He's now dead. So who fired the shot?'
Read more: http://www.dailymail.co.uk/home/moslive/article-1269288/STEPHEN-HAWKING-How-build-time-machine.html#ixzz2VHcv34zg
The following video shows how a black hole "devours" a star.(This video has been accelerated)
How do they form?
When a large star "dies",the star gets smaller.Eventually,the star gets smaller than an atom.
How can a star get smaller,but retain the same amount of mass?
The question is:
You can easily squish a sponge in your hands.If you make something smaller,its gravity gets stronger;so if the star gets as small as an atom,imagine how strong the gravity is.The result of this is,that everything gets pulled into the black hole.
Even light!
Well,it´s like a sponge:
Can our sun get a black hole?
Our sun can´t become a black hole,because only stars with much more mass can get black holes.
The "surface" of a black hole is called the "event horizon."
Some information about
Black Holes
Although impossible,if our Sun became a black hole,Earth's orbit around the Sun would remain unchanged.
Full transcript