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If God wanted man to become a spacefaring species, He would have given man a moon.
— attributed to Krafft Ehricke
reply to post by Galileo400
That's an eye-opening theory, and I plan to look further into it. I always believed there was something special about the Earth/Moon relationship; I was just never sure quite what.
Thanks for bringing this to the forum....
I believe the Moon's greatest impact are the strong tidal forces it exerts on the Earth. These tidal forces not only cause the ocean tides, but they also "work" the mantle keeping it hot and fluid. This is why I feel that the Earth still supports life at the ripe old age of 4.5 billion years.
This isn't quite correct. Venus, Earth and Mars all have liquid portions of their cores...
With regards to Earth and our own moon, it's simply too far away and possess too little mass to help keep the core liquid.
I never said that Venus and Mars had solid cores. I said that their dynamos were not working...as in no convection. (I didn't actually say the no convection part, but that's why.)
These tidal forces not only cause the ocean tides, but they also "work" the mantle keeping it hot and fluid.
Again, I never said that either. I said "mantle", not "core". It is my theory that by keeping this top layer of the mantle moving it helps remove heat which helps maintain a steady convection which is critical to maintaining a working dynamo and possibly preventing major crustal upheavals which would be devastating to life on Earth.
However the dynamo has nothing to do with the mantle (if I'm understanding you correctly), its generation lies entirely within the outer core where the convection of liquid iron induces the magnetic field.
...And if viewed from the surface of Earth, the moon is the exact same size as the sun (the moon's disc perfectly fits the sun's during an eclipse). Artificial moon?