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Description
Cygnus X1 is a very unusual star because it is the first object in space believed to be a black hole. Of course, a black hole cannot be observed directly, but its presence can be inferred by observing its effect on a nearby star, which is being slowly consumed by the gravitational pull of the black hole.

Description
Cygnus X1 is a very unusual star because it is the first object in space believed to be a black hole. Of course, a black hole cannot be observed directly, but its presence can be inferred by observing its effect on a nearby star, which is being slowly consumed by the gravitational pull of the black hole.