Regina Barber

And that it eventually cooled and made this crust over the entire moon.

And this has been verified with those sample return missions.

Yeah.

But, Em, I haven't even told you, like, in my opinion, the coolest thing yet.

What's that?

Cynthia came from the inner solar system.

And this is like a huge clue for how water came to Earth.

I kind of remember you talking about this before.

Tell me again.

Yes.

Okay.

So there are some hypotheses that water came to Earth by objects from space.

They were like carrying water and then they smashed into Earth.

But here's the thing.

So that's Timo Hopp, a planetary scientist and geochemist in Germany.

And he was part of the team that's gotten the closest to finding out where Theia might have come from.

Yeah, this is the clincher that I really, really liked after talking to these researchers, that studying the moon can tell us something about the history of Earth.

It's constantly changing.

Well, Kelsey says it's all about that difference between the far side and the near side of the moon.

And remember, like, the near side is always facing Earth because of how it's formed.