A fascinating discovery: the residual water on the Moon came from the Earth. This means when the Earth suffered the likely collision that produced the Moon it already had oceans and a hard crust, and that the water which made it to the Moon survived the collision (quite a feat). Water is a volatile substance. It had to be imported from the outer solar system, where it could exist in a stable form. The water that eventually reached Earth is essentially the same as the water currently buried in carbonaceous asteroids in the asteroid belt, the water came from the asteroid belt, not comets. This means we probably have to thank Jupiter for life on Earth.
In other news, as I tap this out, there's an annular eclipse approaching over Australia; watch it here.
