What Is A Black Hole, really？

Science is Future

What IS a black hole, really?At first, they were just a mathematical quirk - a weird solution to equations that seemed to otherwise fit our universe. They were only theoretical.   But then… we started to find them….   If you want to know what it would be like to fall into a black hole, subscribe!   #blackhole #animation #space #science #stem #briancox #physics

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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.

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