Brian Cox

And there was no mistake, and he won the Nobel Prize for that discovery. That's the 1990s. So this idea of the universe is accelerating in its expansion. The way that it does that is really important. Is it going to carry on doing that? Is whatever's driving that expansion going to change in some way, which could actually re-collapse the universe again?

We give it a name, by the way, dark energy, this thing. But we don't know what it is. I think it's very fair to say. But it looks a bit like inflation, but it's way slower. So maybe they're linked. Maybe it's the same kind of thing. We don't really know. And so it's one of the great mysteries.

We give it a name, by the way, dark energy, this thing. But we don't know what it is. I think it's very fair to say. But it looks a bit like inflation, but it's way slower. So maybe they're linked. Maybe it's the same kind of thing. We don't really know. And so it's one of the great mysteries.

We give it a name, by the way, dark energy, this thing. But we don't know what it is. I think it's very fair to say. But it looks a bit like inflation, but it's way slower. So maybe they're linked. Maybe it's the same kind of thing. We don't really know. And so it's one of the great mysteries.

But the universe, it looks like the universe is going to continue to expand forever and to continue to accelerate.

But the universe, it looks like the universe is going to continue to expand forever and to continue to accelerate.

But the universe, it looks like the universe is going to continue to expand forever and to continue to accelerate.

Yeah, dark matter's in some sense marginally less confusing in the sense that at least we have an idea of what it might be. Whereas dark energy, there are people listening to it, there are people working on it, so there are theories about what it might be. But I think it feels less explicable, given what we know, than dark matter.

Yeah, dark matter's in some sense marginally less confusing in the sense that at least we have an idea of what it might be. Whereas dark energy, there are people listening to it, there are people working on it, so there are theories about what it might be. But I think it feels less explicable, given what we know, than dark matter.

Yeah, dark matter's in some sense marginally less confusing in the sense that at least we have an idea of what it might be. Whereas dark energy, there are people listening to it, there are people working on it, so there are theories about what it might be. But I think it feels less explicable, given what we know, than dark matter.

But we haven't discovered what... We think dark matter might be some kind of particle. that has got certain properties and doesn't interact very strongly. It interacts like neutrinos, basically, that you mentioned earlier. So it really doesn't interact very strongly. But we thought we might have seen those particles. We're looking for them.

But we haven't discovered what... We think dark matter might be some kind of particle. that has got certain properties and doesn't interact very strongly. It interacts like neutrinos, basically, that you mentioned earlier. So it really doesn't interact very strongly. But we thought we might have seen those particles. We're looking for them.

But we haven't discovered what... We think dark matter might be some kind of particle. that has got certain properties and doesn't interact very strongly. It interacts like neutrinos, basically, that you mentioned earlier. So it really doesn't interact very strongly. But we thought we might have seen those particles. We're looking for them.

They would be passing through this room now, and so we could build a detector in here, and we do that, and we look for these particles. We haven't seen them. We thought we might make them at the Large Hadron Collider at CERN. I think many people thought that we'd see the signature of these things, and we haven't done. So it could be that we're not right with that picture.

They would be passing through this room now, and so we could build a detector in here, and we do that, and we look for these particles. We haven't seen them. We thought we might make them at the Large Hadron Collider at CERN. I think many people thought that we'd see the signature of these things, and we haven't done. So it could be that we're not right with that picture.

They would be passing through this room now, and so we could build a detector in here, and we do that, and we look for these particles. We haven't seen them. We thought we might make them at the Large Hadron Collider at CERN. I think many people thought that we'd see the signature of these things, and we haven't done. So it could be that we're not right with that picture.

So, yes, it's about 5% matter, about 70% dark energy, and the rest, so 25% dark matter. So we're just less than 5% this. That's crazy. And stuff we can see. So everything we can see in the sky, all the gas and the dust and the galaxies and the stars and the black holes, all those things, less than 5%. According to the standard model of cosmology.

So, yes, it's about 5% matter, about 70% dark energy, and the rest, so 25% dark matter. So we're just less than 5% this. That's crazy. And stuff we can see. So everything we can see in the sky, all the gas and the dust and the galaxies and the stars and the black holes, all those things, less than 5%. According to the standard model of cosmology.

So, yes, it's about 5% matter, about 70% dark energy, and the rest, so 25% dark matter. So we're just less than 5% this. That's crazy. And stuff we can see. So everything we can see in the sky, all the gas and the dust and the galaxies and the stars and the black holes, all those things, less than 5%. According to the standard model of cosmology.

Yeah. Wow. But those are models. I mean, it's important to say that it's interesting because until... So we have a hypothesis, which is strongly supported by lots of bits of evidence, that dark matter is some kind of particle. So that's the broadly, that's what you find in the textbooks. But it's true that until you find it, until you see it, then you haven't shown it to be correct.