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- Einstein and Mitchell – two men responsible for the notion of a black hole.
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- To escape the gravity of a celestial object, you have to travel faster than the escape speed.
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- When material gets too close to a black hole, it can be captured in an accretion disk.
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- This galaxy has a large jet emanating from the very center, perhaps evidence of a super-massive black hole.
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- The best evidence that there is a black hole in the center of our galaxy comes from watching the motion of stars orbit this empty point in space.