[meteorite-list] Outside planets?

From: EL Jones <jonee_at_meteoritecentral.com>
Date: Thu Apr 22 10:00:10 2004
Message-ID: <3D412891.97CB029F_at_epix.net>

Steven, I would agree with that conventional wisdom says there should be an
isotopic anomaly or other atomic clue--unless, perhaps Theia was a gaseous
planet and so volatile that it's matter was lost quickly. Or conversely was so
dense as to have settled to our core upon reconsolidation. I assume the
reference to "Mars-Sized" means equivalent mass.

Elton

"S.Singletary" wrote:

>
> I would challenge this statement (or maybe I just misunderstood it) but I
> was under the impression that Theia* must have been formed in much the same
> region as the proto-Earth. The oxygen isotopes from the Moon and Earth are
> identical. They are also close to those of Mars and the HED parent
> body. If Theia had come from outside of the solar system, I would expect
> both the Earth's and Moon's oxygen isotopic composition to be vastly
> different. I'm also guessing that there are also a whole host of other
> geochemical/isotopic arguments that could be made but I don't have my books
> with me at the moment.
Received on Fri 26 Jul 2002 06:48:18 AM PDT