Dr Shane Bergin

It's a place of temperature extreme.

It can range in the sun from 130 Celsius all the way down to a chilly minus 150 in the lunar night.

No life, thin atmosphere, completely barren.

Because it has no atmosphere, it's pocketed with craters from meteorites and various space debris having hit it for billions of years.

Do we know where it came from?

We do.

Oh, good.

Well, sort of.

It's kind of been a scientific mystery for a long time.

The Earth is four and a half billion years old.

And not long after the Earth was formed in the early solar system, a giant Mars-sized object crashed into the Earth.

And it was the mother of all sort of collisions.

And from it, a lot of things happened.

Firstly, the Earth was knocked on its side.

It was tilted, which gave us the seasons.

And also it made the Earth rotate faster.

So a day on the Earth then was only five hours long.

As a consequence of that collision, a lot of debris was sent into orbit and it was reconstituted as the moon.

And so the moon has been there going around us since then.

Of course,