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General Science / Re: Can there be water on the moon?
« on: 15/02/2024 18:04:06 »You don't need a wind.But where do they go? They are still subject to gravitation and no other force.
The sublimed water molecules are travelling at roughly the local speed of sound.
Come to think of it, the speed of sound isn't a terribly useful concept as the only sound conductor on the moon is the occasional and rather lonely water molecule. However we know the shade temperature at the south pole is around 20K, from which we can calculate the speed of a water molecule leaving the surface as about 170 m/s. Escape speed from the moon is about 2400 m/s, so they all end up back at the bottom of the crater.
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