Which of These Is NOT an Argument for Cygnus X-

question 73

Multiple Choice

Which of these is NOT an argument for Cygnus X- 1 being a black hole?

• A) It is the third strongest source of X- rays in the sky.
• B) The X- rays from the compact source vary in as little as a millisecond.
• C) Spectroscopic data suggests hot gas is flowing toward the X- ray source.
• D) The mass of the visible star is greater than that of the X- ray source.
• E) The mass of the X- ray source is about 10 solar masses.

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