Question

What is inside the black hole?

Answer 1

A black hole has a boundary called the event horizon. According to theory, within a black hole there's something called a singularity. A singularity is what all the matter in a black hole gets crushed into.

Answer 2

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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.