Comment Clarification (Score 1) 135
- The heat from the collision would have evaporated/released all elements lighter than X, which includes water. (ed: perhaps water on the moon is more closely related to early earth water coalesced and re-condensed?)
In this scenario, wouldn't much of the released elements have returned thanks to gravity?
Also if we're bringing Theia into it, maybe Theia is the source of the water?