[GeronL]

It is an interesting theory. The problem is that the surface of the moon is likely covered by the remains of meteorites and stuff that have been hitting it since eternity. The rocks brought back by Apollo missions might not have even gotten any real indigenous rocks from beneath this top layer.

They need to send up a digger probe and find out.

Just my opinion.

[SunkenCiv]

Thanks GeronL. Good point. Also, the impact scenario requires that about 50 percent of the original lunar material comes from the impactor -- and since there's a supposed match with (for example) oxygen isotopes of Earth rocks and Moon rocks, either the surface was disproportionately made up of Earth material, or the impactor had a similar ratio. And if the latter is the case, there *is* no evidence for impact. Ta dah! I'd link to the old topic about this question, but it's past my bedtime.

Thanks .

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