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What is believed to be the mass of the black hole candidate Cygnus X-1?

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What is believed to be the mass of the black hole candidate Cygnus X-1?

What is believed to be the mass of the black hole candidate Cygnus X-1?
A) 120 solar masses B) 30 solar masses C) 7 solar masses D) 1 solar mass

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Discovering the Universe

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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