Professor Geraint Lewis

Oh, I've been working on this new sort of experiment we're trying to do to find out if the universe is broken.

Yeah, it is.

A minor question.

It's a big question everyone's looking at at the moment.

It might be that the universe has a preferred direction, which is something that's quite unexpected.

So we're really trying to look at is it broken or not.

Really, if you explode a nuclear bomb on the moon, it would have essentially no effect on the Earth whatsoever.

We think nuclear bombs are very, very powerful.

Of course, they are for humans.

They can destroy cities and decimate large areas.

Astronomically speaking, they're actually a small amount of energy.

So if you wanted to really affect the tides on the Earth, you need a lot more energy.

You would need to move the Moon or break the Moon up, and nuclear weapons just aren't powerful enough.

Sorry about that.

Did you have a plan?

No, no, but maybe I can come up with one.

I'll take that because I work on dark matter, so I know this topic.

So for the last hundred years or so, astronomers have been measuring gravity in the universe.

And what we keep finding is that there's a lot more gravity than we can account for from the stars that we can see.

So basically, we've had to hypothesize that there's extra mass out there that we can't see, but we can feel its gravity.