this post was submitted on 27 Aug 2024
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They do actually appear the same size in the sky though, which is why we get perfect eclipses. The Moon is slowly getting further away from Earth so it won't be forever. We're just in a lucky moment of time in the universe.
It really is just a coincidence.
I know you're right, have read it elsewhere before. But I can't figure out why that would happen. I doubt Earth is loosing mass. Does the moon slow down over time due to impacts or what causes this?
If it slowed down it would get closer, not further. The truth is, any orbit is only stable given a specific timeframe. The longer that timeframe, the less likely any given orbit is to remain. The moon has just a little bit more speed than the Earth can hold onto, so it is in an extremely slow escape, and always has been.
Unfortunately that's not how orbital mechanics works :(
If the moon had instantaneously more speed than the earth can hold onto (e.g. more centrifugal 'force' than balanced by the gravitational force), the moon will accelerate up, until the forces become balanced. This makes a elliptical orbit, like this:
Apparently the reason the moon is getting further away is that it's gaining energy from earth's tides
anyway you should play ksp