posted on Oct, 24 2010 @ 04:05 AM
The moon is younger than the Earth by about 30-50 million years. It is less dense than the Earth because it lacks Earth's iron core. The collision
theory suggests that the lighter mantle material from Earth was ejected into space and stayed in orbit, while the denser material returned due to
Earth's gravity. Over time, the lighter, now orbiting matter coalesced into a single body - our Moon. Perhaps gravitating toward the remains of the
body that collided with Earth in the first place, assuming it lost enough inertia to get locked into our orbit. Since the theory suggests that the
moon formed of many many smaller satellites, it's safe to assume they didn't fit together perfectly like a jigsaw. It is very likely that large
areas beneath the moon's surface are empty voids, just as there are large areas beneath the Earth's surface that are 'hollow' - caverns, lava
vents, etc. But the moon is not a balloon.
As for the optics of eclipses, there is nothing especially miraculous about it's perfectly covering the sun during eclipse. That's just how it is
now. In the distant past, the moon was closer to Earth, and would have completely blocked the sun and more during eclipse. We just happen to be living
at the time when the match is perfect - a nice coincidence for us all. In the distant future, as the moon continues to move away (as it does at a few
cm each year) the moon will no longer cover the sun entirely during eclipse. We live in a dynamic solar system and things are in constant change.
For Eons, the moon had a molten core and active volcanos. The effects of Earth's gravity have been a constant, and pull the shape of the moon from
spherical - moreso when the moon was hot. In fact, both the Earth and the moon's gravity warp the shape of each other even today, and tidal locking
not only affects our seas, but it also moves our mountains as much as 30 cm during each lunar phase. So, when looking at the 'seas' on the moon, you
have to envision them forming on a cellestial body that has been in a very very long flux and under outside influence. Don't expect the dynamics of
the lava flows to match with the mental image of a pristine spherical moon unaffected by the Earth. Remember, this object is 4.5 billion years in the
making; what it is now is not what it has always been, and neither is the Earth.
Although the moon was smooth during it's formation and cooling / baking process, it's taken a lot of hits from space debris over that time. Earth
too, but in our case, a lot of the craters are covered by fauna and water and are diminished by erosion. Most of the hits both took, took place during
the tail period of the Great Bombardment, and most of those craters visible to us are almost as old as the moon itself. There is some question as to
why there are so many craters on the side of the moon facing Earth i.e. shouldn't the Earth have blocked those objects? What we may be seeing when
we look at the lunar surface could in fact be remnants of matter ejected from the Earth as a result of later impacts with rogue objects - huge chunks
of Earth tossed into space and hitting the moon on the facing side.
The face of the moon that we see is locked to Earth by gravity, and eventually, as the moon moves away and the Earth's rotation slows, the Earth will
eventually lock to the moon, and our rotation will match to it's orbit, leading to Earth days that will, in a trillion years or so, last about 1000