A billion solar mass black hole has a radius of only:
A)one solar diameter.
B)20 A.U.
C)400 A.U.
D)3 parsecs.
E)20 parsecs.

Question

Quizplus · Accepted Answer

The radius of a black hole can be estimated using the Schwarzschild radius formula, which is approximately 3 kilometers per solar mass. For a billion solar mass black hole, this would be about 3 million kilometers, or roughly 20 astronomical units (A.U.), making option B the correct choice.

A Billion Solar Mass Black Hole Has a Radius of Only