EXPRECT FROM NASA
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 ara 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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