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In the late 1600's, Stephen Hawking proved that within a black hole, there's infinite density.
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Albert Einstein had a theory that predicted that massive stars collapse into a small area, with a huge gravitational field, so that the light can't escape.
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Subrahmanyan Chandrasekhar, an astrophysicist, mathematically proved that black holes are the remains of billions of stars.
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In 1967, John Wheeler created the term 'black hole' and made it popular.
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In 1974, Sir Martin Rees introduced the theory that black holes can exist within certian and different galexies. He thought that black holes could explain the huge amounts of radiation observed at the center of galexies.
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In 2004, a UCLA team gives strong evidence that Sagittaruis A, something that scientists had been consuded about for a while, is in fact a black hole.
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In December of 2004, NASA's telescope observed bright flashes of light known as "gamma ray bursts" which is how they are made, according to NASA.
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A black hole was found in the M-100 Galxay and it's so far the youngest black hole ever discovered, only being 32 years old.
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"Redirect Notice." Redirect Notice. Web. 13 Dec 2013. "Black Holes Photos." National Geographic. Web. 13 Dec 2013
