Quote:
Originally Posted by orlok
Ok, a quickie, as I saw this recently and would like to know the answer myself (I saw it, but didn't believe...).
How many moons does the Earth have?
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It depends on how you define "moon". The answer could be 0, 1, 2 or more.
Zero: Earth and Luna could be considered a double-planet, not a planet & moon.
One: Well, obviously!
Two: If you define a moon to be any object with a linked orbit,
3753 Cruithne would be a second moon, as QI once tried to assert.
More: There are almost certainly other objects with orbits around the sun like Cruithne's. And then there are all the artificial moons we've put in orbit around the Earth!