Re: Searching for Theia, the mother of the Moon

Dear Yousuf Khan:

"Yousuf Khan" <bbbl67@xxxxxxxxx> wrote in message
news:49e22ed6$1@xxxxxxxxxxxxxxxxxx
N:dlzc D:aol T:com (dlzc) wrote:
and then a gravitational tug from a growing Venus
destabilized it and slung it towards Earth.

Total bull. Would take an en passant maneuver to
strip the angular momentum.

And also note they're talking about the Earth-Sun
Langrangian points, not the Earth-Moon
Lagrangians, so why wouldn't there be an L4 or
L5 without a moon?

Sorry. Still takes an en passant...

Yeah, as I said, I have my own problems with this
theory besides that.

This will take some time. All / most-of the light
stuff had to sort out after the "mixing event", as
that is what the Moon got.

followed by a solidification of the Moon,

No atmosphere, possibly no shielding by Earth
(assuming it was "lobed off") but meters of
crust won't hold a crater impression. Are there
*any* mares on the far side?

Also if a Mars-sized object hit Earth, wouldn't we
see a somewhat lopsided Earth? They say that
most of Theia sunk to the core of Earth, but that
would require displacement of everything that was
already at the core of the Earth. It would require
the Earth to have blown up and come back
together for such perfectly round mixing of the
combined bodies to happen again. And the Earth
would look a bit younger than the other planets in
the Solar System, because it would look like it
formed later.

There is no need for Earth+Theia to do more than melt. There was
plenty of extra energy to permit that. Then the products spin,
with a very oblate shape, a lobe starts to form as the system is
unstable, the lighter materials get pulled up into the lobe, and
the lobe parts. See it in lava lamps sometimes.

And there are not many solid formations that date back past 3
billion years...

Now if Theia was actually a Mars-sized black
hole instead, then it could easily make its way
to centre of the Earth and provide power source for
the magnetic field that Earth has.

Mars *massed* black hole, you mean. No the structure of the
Earth is not solid enough to permit that... we'd flow in.

I guess I've just added a wacky new theory. :-)

A lot of whacks have already proposed it...

I mean a merger of two solid planets can't be
nearly as simple as say the merger of galaxies,
which have large gaps in between.

Agreed. I would expect quite a bit of debris. Locally, the Moon
would sweep that. But in our solar L4 and L5...

It would seem to me that the Moon would still be
mostly molten by the time the asteroid
bombardment happened,

Agreed.

thus most of its scars would've been healed
over by now.

... like the mares...


Besides the collision theory, and the capture theory,
why can't the Moon have simply formed where it is
now? That would seem to be the simplest answer.

We have records that date back to 2.2 Gy ago that says the Moon
was much closer.

David A. Smith


.

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