The Blue Marble
As MinuteEarth explains, the question isn’t so much whether our water came from space, but rather how it got here, what kind of space rocks it was riding on. It turns out that while there are lots of different comets and asteroids out there, flying frozen water through every corner of the galaxy, our azure lakes came from a very specific flavour of space rock.
So the next time you drink a glass of water, remember it was delivered from the great void. [MinuteEarth]