How do you know about Black Holes?

From space/ astronauts

Explanation:

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. They are invisible. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars.

Explanation:

the black hole is in space and have a higher gravity pull that can pulls the photons of light so we see it black and we can find it in everywhere in universal

answer///scientific method;