It is thought that we might never have developed the obsession we have with time and that we might have been very slow to develop mathematics and science if we didn't have a great big moon. Plus, it just happens to be the right angular size to make solar eclipses pretty spectacular events.
And when you consider that none of the inner planets have any moons (Mars's are captured asteroids that are really just pebbles) and that ours is almost certainly the result of a collision between the earth and another planetesimal, we're astonishingly lucky.
Plus, it's amazingly beautiful.
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