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The oldest dated moon rocks, however, have ages between 4.4 and 4.5 billion years and provide a minimum age for the formation of our nearest planetary neighbor.
.www.geosociety.org... It is not surprising that it may contain components differing from moon rocks.
The powdery grey dirt is formed by micrometeorite impacts which pulverize local rocks into fine particles
The Moon was pummeled to such a great extent that the materials we see today on the lunar surface are directly related to the materials excavated and ejected from ancient basin-forming events. The degree to which the far-flung ejecta from the Moon's largest basins influenced the distribution of observed geochemical terranes is the subject of work by Noah Petro (formerly of Brown University and now at NASA Goddard Space Flight Center) and Carle Pieters (Brown University).
The lunar magma ocean was followed by a series of huge asteroid impacts that created basins which were later filled by lava flows. The large, dark basins such as Mare Imbrium are gigantic impact craters, formed early in lunar history, that were later filled by lava flows about 3.2 to 3.9 billion years ago. Lunar volcanism occurred mostly as lava floods that spread horizontally; volcanic fire fountains produced deposits of orange and emerald-green glass beads.
It is shown that hydrostatic equilibrium theories can account for the excess filling of lava in circular maria and that mascons will result when this process occurs in the presence of a thick rigid lithosphere.
In this case, the release of potential energy through the fault system would be adequate to explain moonquakes, their properties, and the clustering of the locations of lunar transient events around the circular maria.
Of the many theories proposed, we believe that they are the outcome of lunar outgassing, that is, gas being released from the surface of the Moon. To learn more about the evidence supporting this hypothesis, please read our scientific papers below.
The Moon's density is fairly uniform throughout and is only about 3.3 times the density of water. If it has an iron core, it is less than 800 kilometers in diameter. This is a sharp contrast from planets like Mercury and the Earth that have large iron-nickel cores and overall densities more than 5 times the density of water. The Moon's mantle is made of silicate materials, like the Earth's mantle, and makes up about 90% of the Moon's volume.
Continental Crust: 2.7 to 3.0
Oceanic Crust: 3.0 to 3.3
Mantle (silicates): 3.3 to 5.7 (increasing with depth?)
Outer Core (liquid): 9.9 to 12.2
Inner Core (solid): 12.6 to 13.0
Originally posted by Phage
reply to post by bsbray11
The moon rotates. It rotates at the rate of once every 27 (point something) days. If it did not rotate there would not be a far side which is never visible. This has nothing to do with physics. This is a simple fact. That you don't know this is an indication of how you can reject the facts of physical science.
[edit on 2/26/2009 by Phage]
Originally posted by Jiffy
Originally posted by Chonx
To reiterate that:
The Sun is 400 times bigger than the Moon but also 400 times further away.
Flaw in your equation right here.
The Sun > 400x The Moon.
Originally posted by TNT13
reply to post by Jiffy
He's actually right that the diameter of the sun is 400 times larger and his equation proves it. We're not talking entire area we're talking diameter. If it was entire area 64 million moons can fit inside the sun.
[edit on 26-2-2009 by TNT13]
Hmmm, well...seeing as all humans are on Earth and a coincidence is a human concept.... it is! come on man, you're just being pedantic!
Originally posted by Chonx
Another point of interest is the fact that we have an abnormally large Moon and how this may go some way as to explain why life even evolved here in the first place. The stabalizing effect the Moon's gravity has on the Earth's wobble may well have played a part in the creating the stable environment life requires to evolve, or at least increased the chances of it happening.