Re: Searching for Theia, the mother of the Moon

Dear YKhan:

"YKhan" <yjkhan@xxxxxxxxx> wrote in message
news:58f60411-3f58-4869-b611-0ecd797e0fa4@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Apr 18, 7:30 pm, "N:dlzc D:aol T:com \(dlzc\)" <dl...@xxxxxxx>
wrote:
....
I think the difference between the two is the
"dynamo" at the core of the Earth. It provides
the crustal flow and the magnetic field.

There must be something powering the Earth's
dynamo. Large uranium deposits inside the
Earth's iron core keeping it hot and spinning.
The question is why Venus didn't have a
similar power source?

Is the dynamo, Theia?

Well, we did say that the Moon is mainly the
lighter materials, such as silicates. The
heavier materials like iron, sank to the bottom
of the core.

It is 60% the density of the Earth. I doubt it got
much iron from Earth. The Moon and Mars are
awfully close in density... as are a number of
asteroids.

Maybe that's as dense as terrestrial planets get,
if they don't have a big iron core in their centers?
The Moon and Mars don't have a big iron core,
but the Earth does. What's Venus's density?

http://nssdc.gsfc.nasa.gov/planetary/fact***/index.html
.... slightly less than Earth, as is Mercury.

I bet it's pretty close to Earth's too. Mercury is
apparently the most dense planet in the solar
system, because it's nearly entirely iron.

No, we are.

Insulation between the Earth and the Sun lowers our
temperature. And there was a post recently that the
Earth is passing through such a dust cloud, if not as
thick as it would need to be.

Oh, I see what you mean. But that dust cloud would
have to be immense to provide such level of insulation
that it blanketed the planets out to the heliosphere.

I found a link:
http://news.uchicago.edu/news.php?asset_id=1537

Was it always as sparse as it is now? 2300 ly seems
a long way to send dust.

Okay, but what has it got to do with dust around our
own solar system? They don't mention any link to
our solar system.

We are constantly bombarded with dust. We never knew where it
could have come from. Now we know a(nother) mechanism.

David A. Smith


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