Astronomers think that cygnus x-1 contains a black hole because the unseen object orbited by a luminous star is too massive to be a neutron star and is therefore denoted as option B.
This is referred to as a type of scientists who studies the Universe and the objects within and around it.
Cygnus x-1 is referred to as a galactic X-ray source in the constellation Cygnus and was widely accepted to be a black hole as a result of the unseen object orbited by a luminous star is too massive to be a neutron star.
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