English: Images of and about Cygnus X-1, a compact X-ray source that is thought to be a black hole.
Stellar system in which one star (HDE 226868) is transferring material on to the accretion disc of a likely black hole, and causing x-rays to be emitted.
|Instance of||binary star|
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Media in category "Cygnus X-1"
The following 6 files are in this category, out of 6 total.