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.
Correct Answer:
Verified
Correct Answer:
Verified
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