Brian Cox

So really in bits, I mean, the idea is, and I should say it's very much in principle this, so no one thinks in practice you could reconstruct what I wrote down on this if you set fire to it. But in principle... Well, maybe sometime in the future. Yeah, in principle, you could just collect everything.

Then somewhere in all that radiation and ashes and light that's come off the thing is the information. It's there. So you could reconstruct the book or what I wrote on this page in principle. But the thing about Stephen's calculation was that even in principle, it said there is no information.

Then somewhere in all that radiation and ashes and light that's come off the thing is the information. It's there. So you could reconstruct the book or what I wrote on this page in principle. But the thing about Stephen's calculation was that even in principle, it said there is no information.

Then somewhere in all that radiation and ashes and light that's come off the thing is the information. It's there. So you could reconstruct the book or what I wrote on this page in principle. But the thing about Stephen's calculation was that even in principle, it said there is no information.

And by the way, it's kind of easy to see why, actually, because this radiation, this Hawking radiation that comes off the black hole, it's coming from the horizon of the black hole. So I should say what the horizon is maybe.

And by the way, it's kind of easy to see why, actually, because this radiation, this Hawking radiation that comes off the black hole, it's coming from the horizon of the black hole. So I should say what the horizon is maybe.

And by the way, it's kind of easy to see why, actually, because this radiation, this Hawking radiation that comes off the black hole, it's coming from the horizon of the black hole. So I should say what the horizon is maybe.

Remember I said that the sun, if you squashed it down within three kilometres of radius, you'd get this kind of distortion in space and time from which if you went in across this region, three kilometres, you went inside it, you couldn't get out. So that's called the event horizon.

Remember I said that the sun, if you squashed it down within three kilometres of radius, you'd get this kind of distortion in space and time from which if you went in across this region, three kilometres, you went inside it, you couldn't get out. So that's called the event horizon.

Remember I said that the sun, if you squashed it down within three kilometres of radius, you'd get this kind of distortion in space and time from which if you went in across this region, three kilometres, you went inside it, you couldn't get out. So that's called the event horizon.

So you wouldn't notice if you fell through the horizon of the black hole in the Milky Way galaxy if you went into that one. We could be falling through that horizon now in this room, and we wouldn't notice anything except that we couldn't get out again. And ultimately, in a few hours, in that case, time would end for us. So you go to the end of time. We could talk about that.

So you wouldn't notice if you fell through the horizon of the black hole in the Milky Way galaxy if you went into that one. We could be falling through that horizon now in this room, and we wouldn't notice anything except that we couldn't get out again. And ultimately, in a few hours, in that case, time would end for us. So you go to the end of time. We could talk about that.

So you wouldn't notice if you fell through the horizon of the black hole in the Milky Way galaxy if you went into that one. We could be falling through that horizon now in this room, and we wouldn't notice anything except that we couldn't get out again. And ultimately, in a few hours, in that case, time would end for us. So you go to the end of time. We could talk about that.

There's a picture of that. Maybe I should talk about it. This is getting quite complicated already, isn't it? We didn't start in a relaxing way, did we?

There's a picture of that. Maybe I should talk about it. This is getting quite complicated already, isn't it? We didn't start in a relaxing way, did we?

There's a picture of that. Maybe I should talk about it. This is getting quite complicated already, isn't it? We didn't start in a relaxing way, did we?

No need to. Let's get right into it. So we wouldn't notice anything. Not for the big black holes. So, yes, these supermassive black holes, we could fall across this horizon. It's just like being in empty space for us. So we'd just be talking now when we could have been talking on the outside of the horizon.

No need to. Let's get right into it. So we wouldn't notice anything. Not for the big black holes. So, yes, these supermassive black holes, we could fall across this horizon. It's just like being in empty space for us. So we'd just be talking now when we could have been talking on the outside of the horizon.

No need to. Let's get right into it. So we wouldn't notice anything. Not for the big black holes. So, yes, these supermassive black holes, we could fall across this horizon. It's just like being in empty space for us. So we'd just be talking now when we could have been talking on the outside of the horizon.

And by the time I finished the sentence, we could be on the inside of the horizon, inside the black hole. And... according to Einstein's theory at least, which is the theory that predicted them initially, we could just do that, we could just go in And we wouldn't notice for a bit. The thing we would notice ultimately is you go inexorably. Nothing you can do.