00:00Let's say you take the Sun and you squash it down and you squash it and
00:03squash it until its radius becomes three kilometers. If you artificially squashed
00:07all that mass into that tiny space, the gravity right at its surface would be
00:12immense. So immense that if you wanted to escape... The speed you'd have to travel to
00:17escape its gravitational pull, it's called the escape velocity, would exceed the
00:22speed of light. You can write the equations as a space being like a river
00:26that flows into this thing. If you imagine that you're a particle of light, you're
00:30like a little fish swimming against the tide, you can't get out. That's a black
00:35hole. Over decades scientists measured the movement of stars and galaxies and gases
00:39that were warped by seemingly empty patches of space. We can now tell they're
00:43all over our universe. Some estimates say there are up to 40 quintillion of them,
00:48including the supermassive black hole at the center of our galaxy. If you want to
00:52know what it would be like to fall into it, subscribe.
Comments