Suppose each of the following objects could collapse into a black hole. Each black hole would have a sphere around it that is the limit for escape -- once you are inside this region, you cannot get away. For which object would this region be the largest in diameter?

Question

Quizplus · Accepted Answer

The size of the region from which nothing can escape around a black hole, also known as its event horizon, is directly proportional to its mass. Therefore, the black hole formed by an entire galaxy of stars, with a mass of about a billion times that of our Sun, would have the largest event horizon.

Suppose Each of the Following Objects Could Collapse into a Black