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What is the purpose of moon?

This is your chance semi-literates...fill in your theories.
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DunningKruger · 61-69, M
Do you mean what is the purpose of the moon, as in the big natural satellite around the earth?

It doesn't have a "purpose." It simply is.
Unlearn · 41-45, M
@DunningKruger write more...
DunningKruger · 61-69, M
@Unlearn Write more what?
Unlearn · 41-45, M
@DunningKruger on moon...
DunningKruger · 61-69, M
@Unlearn The general idea (the latest I've heard, at least) is that early in the evolution of the Solar System, the proto-Earth collided with a planetoid about the size of Mars. This pretty much liquefied both bodies, more or less, throwing a huge amount of material into orbit around the larger of the bodies. Over time, that material coalesced into the moon.

The earth-moon system rotates around a common center of gravity, which isn't the center of the earth but is still located inside the earth because of the mass disparity between the two bodies. This has had the benefit of keeping earth's rotation relatively stable. Without this stability, the planet would flip on its axes and wobble a lot more than it does, likely creating a lot of tectonic issues and quite possibly making the environment on the surface of earth too chaotic and hostile for life to have ever evolved.