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We really can't "see" a black hole. What we "look" for is a high

concentration of x-ray emissions. Some of these places (possibly

black holes) are a cluster called M15 approx. 35,000 light years away.

The most popular one is Cygnus X-1 which is an eclipsing binary star

system approx. 10,000 light years away - the closest I know of.

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16y ago

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