Question

What is the circumference of a black hole?

Answer 1

For a black hole whose mass equals 10 suns, this radius isabout 30 kilometers or 19 miles, which translates into a critical circumference of 189 kilometers or 118 miles.

Answer 2

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19 to 119 miles

A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out, people can't see black holes.