Is the Moon hollow?
I once heard that the moon was hollow, I would like to know if this is true and why?
The Moon is not hollow. It is possible to tell this because when we have had things in orbit around the Moon, how they orbit in the Moon's gravity tells us about the mass of the Moon. We also know the size of the Moon so we can work out the density and see that it is not possible for the Moon to be hollow.
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