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> The Moon!
MikeW
post Mar 6 2006, 02:15 AM
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I did an Google search as to why the Moon does not seem to rotate.
Got lots of returns similiar to the following....


"How it works: If you go out on several different nights and look at the Moon, you will always see the same features, at about the same position. It looks as if the Moon doesn't rotate! Ah, but it does.

This can be seen using a model. Grab two oranges (or apples, or baseballs, or whatever roughly spherical objects you have handy). Mark one with an "X"; this represents a feature on the Moon. Now put the other one down on a table; this is the Earth. Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Earth model. Now move the Moon model as if it were orbiting the Earth, taking care to make sure that the X faces the Earth model at all times.

Surprise! You'll see that to keep the X facing the Earth model, you have to rotate the Moon model as it goes around the Earth model. Furthermore, you can see you have to spin it exactly once every orbit to keep the X facing the Earth model. If you don't rotate it, the Moon model will show all of its "sides" to the Earth model as it goes around.

Now, I have been a bit tricky here. We are talking about two different frames of reference; one on the surface of the Earth looking out at the Moon, and one outside the Earth-Moon system looking in. You performed the experiment from the latter frame, and saw the Moon rotating. From the former, however, you can see for yourself the Moon does not rotate. What is being argued here is that in one frame the Moon rotates, in another it does not.

We've actually learned three things:
# 1) the Moon rotates as it orbits the Earth (as seen by an outside observer);
# 2) it rotates one time for every orbit (to that observer); and
# 3) if it didn't rotate, we would eventually see all of the Moon as it orbited the Earth. "


Now my theory goes like this.....

If the moons centre of gravity was in the centre and it didn't rotate, we would see all of the surface of the moon.
Don't confuse the centre of gravity with the moons core, there maybe more mass on the near side than the far so the pull of earths gravity is on the heavier area of mass hence the moon is prevented from spinning.
Now we've all read the transcripts of the Appollo missions where the landing craft was jettersand on the return voyage, fell back to the moon and the siesmic devices recorded echos that reveberated for several hours, this may be due to cavernous areas within the far side of the moon just like the cavernous areas of Earth.
Maybe there are Aliens camped out in those areas!
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Google Bot
post Mar 6 2006, 02:15 AM
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Xeno
post Mar 6 2006, 06:12 AM
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Ah, i woundered how it span and rotated while facing us,

EDIT: Ive tested it and it works, Here's a video i made using Cinema4D Showing it
Online Video:= http://youtube.com/watch?v=OpfSFYMXEzo

The centre is Earth, Outer is moon,

Sry for the dodgy orbit, but you try making a Ball spin perfectly 1 frame at a time
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humanoidaling
post Mar 7 2006, 10:35 PM
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Very interesting. I never thought about that, but it's very interesting.
One thing though. The explanation never mentions Earth's rotation. I don't know if that has to do with the view of the moon or not, but it seems it would.
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trog
post Mar 8 2006, 10:32 PM
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I dont think the entire moon is hollow. They say that the earth also has a bell sound when struck. I was just talking about the hollow moon in another thread. Maybe the site we landed on was chosen by another group of observers in our Universe because of how flat it was. Perhaps they dug out the region and underneath that one area is a base but most of the moon is solid.

We can pretty much imagine anything about the moon if we like. I made a comment in my thread about how in the 1600's, there was a large fireball reported by many people on earth who saw it (mostly from europe). The first guess by scientist was a meteorite had slammed into the surface. One of the last to do so. But what if it was an explosion within a base on the moon?
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Andrew
post Mar 9 2006, 02:29 AM
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Why the moon rotates exactly once per orbit (and thus shows only one face to us) is no mystery and is explained by the phenomenon of tidal locking. The moon is not the only body in the solar system to exhibit this. Pluto and its moon Charon are both tidally locked to eachother (thus displaying the same faces to one another as they orbit).
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Ele-mental
post Mar 10 2006, 06:11 PM
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Just think of the moon as one giant polo mint, all sweet on the outside covering one great hole.
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Ele-mental
post Mar 10 2006, 07:15 PM
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By the way, listen for the ringing, it could be E.T. phoning home. Exchange moon.
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seth
post Mar 10 2006, 07:32 PM
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I believe mercury is also tidally locked.
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Andrew
post Mar 11 2006, 05:50 AM
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(seth)
I believe mercury is also tidally locked.

As the Wikipedia article points out, it is actually in a 3:2 spin-orbit resonance with the sun, i.e. rotating thrice every two orbits about the sun.
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seth
post Mar 11 2006, 09:01 AM
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(Andrew)
As the Wikipedia article points out, it is actually in a 3:2 spin-orbit resonance with the sun, i.e. rotating thrice every two orbits about the sun.



Thank you for the correct info biggrin.gif
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