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What Is a Black Hole?
09.30.08
 

A black hole with gas spiraling into it

An artist's drawing shows a large black hole pulling gas away from a nearby star. Image Credit: NASA E/PO, Sonoma State University, Aurore Simonnet
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A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. 

Because no light can get out, people can't see black holes. They are invisible. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars. 

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  • Apr 02 Sat 2011 11:46
  • mouse

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http://www.youtube.com/watch?v=tB1AL9mWlHM&feature=related

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http://www.youtube.com/watch?v=F6wo6c92ZVM

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http://www.youtube.com/watch?v=mim5vpsAGY0

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http://www.youtube.com/watch?v=mim5vpsAGY0

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http://www.youtube.com/watch?v=Vn0Xv0fb1z4&feature=related

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