Janna Levin

No thing. They're nothing.

No thing. They're nothing.

No thing. They're nothing.

That's what I mean. That's the more profound aspect of the black hole. So you asked originally, how do they form? And I think that even when you try to form them in messy astrophysical systems, there's still nothing at the end of the day left behind. This was a very big surprise, even though Einstein accepted that this was a true prediction. He didn't think that they'd be made.

That's what I mean. That's the more profound aspect of the black hole. So you asked originally, how do they form? And I think that even when you try to form them in messy astrophysical systems, there's still nothing at the end of the day left behind. This was a very big surprise, even though Einstein accepted that this was a true prediction. He didn't think that they'd be made.

That's what I mean. That's the more profound aspect of the black hole. So you asked originally, how do they form? And I think that even when you try to form them in messy astrophysical systems, there's still nothing at the end of the day left behind. This was a very big surprise, even though Einstein accepted that this was a true prediction. He didn't think that they'd be made.

And it was quite astounding that that people like Oppenheimer, actually it's probably Oppenheimer's most important theoretical work, who are thinking about nuclear physics and quantum mechanics, but in the context of these kind of utopian questions. Why do stars shine? Why is the sun radiant and hot? this amazing source of light.

And it was quite astounding that that people like Oppenheimer, actually it's probably Oppenheimer's most important theoretical work, who are thinking about nuclear physics and quantum mechanics, but in the context of these kind of utopian questions. Why do stars shine? Why is the sun radiant and hot? this amazing source of light.

And it was quite astounding that that people like Oppenheimer, actually it's probably Oppenheimer's most important theoretical work, who are thinking about nuclear physics and quantum mechanics, but in the context of these kind of utopian questions. Why do stars shine? Why is the sun radiant and hot? this amazing source of light.

And it was people like Oppenheimer who began to ask the question, well, could stars collapse to form black holes? Could they become so dense that eventually not even light would escape? And that's why I think people think that black holes are these dense objects. That's often how it's described. But actually what happens, these very massive stars, they're burning thermonuclear fuel.

And it was people like Oppenheimer who began to ask the question, well, could stars collapse to form black holes? Could they become so dense that eventually not even light would escape? And that's why I think people think that black holes are these dense objects. That's often how it's described. But actually what happens, these very massive stars, they're burning thermonuclear fuel.

And it was people like Oppenheimer who began to ask the question, well, could stars collapse to form black holes? Could they become so dense that eventually not even light would escape? And that's why I think people think that black holes are these dense objects. That's often how it's described. But actually what happens, these very massive stars, they're burning thermonuclear fuel.

You know, they're earthfuls of thermonuclear fuel they're burning. And emitting energy in E equals mc squared energy. So it's fusing. It's a fusion bomb. It's a constantly going thermonuclear bomb. And eventually it's going to run out of fuel. It's going to run out of hydrogen, helium stuff to fuse. It hits an iron core. Iron to go past iron with fusion is actually energetically expensive.

You know, they're earthfuls of thermonuclear fuel they're burning. And emitting energy in E equals mc squared energy. So it's fusing. It's a fusion bomb. It's a constantly going thermonuclear bomb. And eventually it's going to run out of fuel. It's going to run out of hydrogen, helium stuff to fuse. It hits an iron core. Iron to go past iron with fusion is actually energetically expensive.

You know, they're earthfuls of thermonuclear fuel they're burning. And emitting energy in E equals mc squared energy. So it's fusing. It's a fusion bomb. It's a constantly going thermonuclear bomb. And eventually it's going to run out of fuel. It's going to run out of hydrogen, helium stuff to fuse. It hits an iron core. Iron to go past iron with fusion is actually energetically expensive.

So it's no longer... going to do that so easily. So suddenly it's run out of fuel. And if the star is very, very, very massive, much more massive than our sun, maybe 20, 30 times the mass of our sun, it'll collapse under its own weight. And that collapse is incredibly fast and dramatic, and it creates a shockwave. So that's the supernova explosion.

So it's no longer... going to do that so easily. So suddenly it's run out of fuel. And if the star is very, very, very massive, much more massive than our sun, maybe 20, 30 times the mass of our sun, it'll collapse under its own weight. And that collapse is incredibly fast and dramatic, and it creates a shockwave. So that's the supernova explosion.

So it's no longer... going to do that so easily. So suddenly it's run out of fuel. And if the star is very, very, very massive, much more massive than our sun, maybe 20, 30 times the mass of our sun, it'll collapse under its own weight. And that collapse is incredibly fast and dramatic, and it creates a shockwave. So that's the supernova explosion.

So a lot of these, they rebound because once they crunch, they've reached a new critical capacity where they can reignite to higher elements, heavier elements, and that sets off a bomb, essentially. So the star explodes, helpfully, because that's why you and I are here, because stars send their material back out into space, and you and I get to be made of carbon and oxygen and all this good stuff.

So a lot of these, they rebound because once they crunch, they've reached a new critical capacity where they can reignite to higher elements, heavier elements, and that sets off a bomb, essentially. So the star explodes, helpfully, because that's why you and I are here, because stars send their material back out into space, and you and I get to be made of carbon and oxygen and all this good stuff.