How do we measure or calculate the size of the black hole in the center of a quasar?
A)Observe a star moving around the black hole and use Kepler's third law to calculate the central mass.
B)Measure directly the size of the dark area corresponding to the black hole.
C)Use the Eddington radiation limit.
D)Watch a star fall through the event horizon and measure its acceleration.

Question

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The Answer of How do we measure or calculate the size of the black hole in the center of a quasar?
A)Observe a star moving around the black hole and use Kepler's third law to calculate the central mass.
B)Measure directly the size of the dark area corresponding to the black hole.
C)Use the Eddington radiation limit.
D)Watch a star fall through the event horizon and measure its acceleration.

How Do We Measure or Calculate the Size of the Black