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.

Firefly's Blue Ghost mission is snapping stunning photos on its way to a lunar landing attempt. They show a new era of moon ...