What happens if you cross a black hole's event horizon?

Added: 2026-06-11

[00:00:00]It's a point of no return.

[00:00:01]>> we know that?

[00:00:02]>> Well, we've never seen it happen, but we can calculate the escape velocity.

[00:00:07]In other words, if you want to leave the Earth, how fast do you have to move to leave the Earth? 7 mi/s.

[00:00:13]Our astronauts travel 7 mi/s to reach the moon. Okay? That's called escape velocity.

[00:00:20]So, every gravitating piece of matter has an escape velocity. For the Earth, it's 7 mi/s. What about the escape velocity of a black hole? It's the speed of light.

[00:00:34]That's why if you fall through the event horizon of a black hole, you never come out.