How Do We Know The Black Hole Is Black?

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...

First of all, you would see the strangest funhouse mirror in the universe. Matter isn't the only thing orbiting a black hole: Gravity is so strong near them that light can orbit too. 

• If you hovered just outside the event horizon, at the photon sphere, in any direc...

A black hole is a region where gravity is so strong that light cannot escape itself.

A black hole has a boundary called the event horizon. It is where gravity is just strong enough to track light back and prevent it from escaping. Because nothing can travel faster than ligh...