For this reason black holes are invisible to the eye, as lightless as the empty, dark space surrounding them. Scientists know they exist not because they can see an actual hole, b ...
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Astronomers discover that a well-known X-ray binary is actually a hidden ultraluminous X-ray sourceThis revelation has led to the identification of Cygnus X-3 as a member of the class ... of these distant ULXs residing within our own galaxy." The researchers believe this significant finding ...
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