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xMonty
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Is our moon slowly receding? is it getting further from us? if so why?
S.Vasojevic said:Ok, I read the article, and they suggest that Moon, they believe, may harbor liquid core. But they never say what it could be. So, what it could be, magma? I thought that moon is geologically dead.
Since there isn't any magma around the Earth's large iron core why would you expect around the Moon's?qraal said:They thought it would probably be dead, but all the evidence suggests there's significant residual heat closer to the core. There's probably some magma around a small iron core.
Ophiolite said:Since there isn't any magma around the Earth's large iron core why would you expect around the Moon's?
Sorry! said:Woah what? There's no magma around Earths solid core? References please.
Consult any basic textbook on geology. (I presume the routine on this forum is the same as on other forums i.e. the person making the extraordinary claim is the one required to provide the references, not the person stating the facts, so it's really up to you to provide references for the idea of magma around the core.)Sorry! said:Woah what? There's no magma around Earths solid core? References please.
diogenesNY said:Just guessing here, but I _suspect_ that the disconnect may be a semantic one:
Earth's core is a solid metalic surrounded by a liquified molten iron (and some other heavy metalic crud) molten core... thus the dynamo effect giving us that lovely magnetic field that keeps us from getting fried...
...as distinct from _basaltic magma_ (and a few other kinds) which is what is often what is meant in casual conversation when speaking of 'magma', notwithstanding more precise definitions and terminology.
If I am off base on what was meant, however, please call it.
diogenesNY
MikeyW said:I remember reading about the theorem (Tisserand's criterion rings a bell) that the moon will never actually leave the Earth's orbit, and is confined to within a certain orbital radius as a result of the findings of the circular-restricted three body problem. It was shown that the moon is in a stable orbit that will never reach a certain critical "zero-velocity surface", I think this is summarised in Moulton's book on celestial bodies. I don't know if the assumptions made are invalid in our system,
Yes, our moon is moving away from the Earth at a rate of approximately 3.78 centimeters per year.
The moon is moving away from the Earth due to tidal forces.
The moon has been moving away from the Earth for approximately 4.5 billion years.
No, the moon will not leave the Earth's orbit completely. It will continue to move away from the Earth until it reaches a stable distance.
The moon's movement has a small impact on Earth's rotation, causing the length of a day to increase slightly over time. It also affects ocean tides, with higher and lower tides occurring as the moon moves further away.