It's a familiar puzzle that many of us face on an almost daily basis. When nature calls and your only option is a public toilet, which cubicle should you pick?

The moon is Earth's longtime, familiar companion, the story of when and how it got there is actually a bit of an unanswered question in astronomy.

The fact that you can't breathe on the moon probably isn't surprising. That said, the moon does have an atmosphere; it's just very different than Earth's.