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How is a black hole discovered?
Black holes are astrophysical objects with an almost unbelievably high mass per unit volume. Within a certain distance from the black hole this warping of space is so strong that absolutely no light or any other radiation can leave. Therefore, black holes cannot be observed. So how do astrophysicists know that they exist?
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Last update: 14/01/2010 13:55:50
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International Year of Astronomy 2009
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