Traces of water in moon came from Earth, study finds

[muriel_volestrangler]

4. No, because it is about a time before life on earth started

(or, just possibly, when it had formed once, and was then wiped out by the enormous collision that formed the Moon from a significant part of the mantle of the Earth - but that's pure speculation that life could have formed earlier and then get wiped out, on my part; the point is that the ancestor of all life on earth formed after the collision).

This is water that was trapped inside the volcanic glass when the collision happened. Or, as Jim__'s link below suggests, came from carbonaceous chondrite meteorites after the Moon was formed. But they're not saying it came from an Earth with life.