Since Origins: The Earth is Born was produced (2004), scientists have found more evidence to narrow down the source of Earth's water: Carbonaceous Chondrite.  Check it out!

Asteroids reveal secrets about Earth's past.  They are responsible for both life and death on our planet. But how do scientists study asteroids?  Is Earth in danger of a meteor crash?   

Are you intrigued?  Then check out the BBC documentary on asteroids big and small below!