What Makes Us Think That the Star System Cygnus X-1

question 61

Multiple Choice

What makes us think that the star system Cygnus X-1 contains a black hole?

• A)It emits X-rays characteristic of an accretion disk,but the unseen star in the system is too massive to be a neutron star.
• B)No light is emitted from this star system,so it must contain a black hole.
• C)The fact that we see strong X-ray emission tells us that the system must contain a black hole.
• D)Cygnus X-1 is a powerful X-ray burster,so it must contain a black hole.

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