An artist's illustration of the Cygnus X-1 system. Cygnus X-1 is a so-called stellar-mass black hole, a class of black holes tha

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An artist's illustration of the Cygnus X-1 system. Cygnus X-1 is a so-called stellar-mass black hole, a class of black holes that comes from the collapse of a massive star.

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Size: 5011px × 3535px
Photo credit: © Stocktrek Images / Alamy / Afripics
License: Royalty Free
Model Released: No

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