A
ball of
rock that
orbits a larger
ball of
rock and/or
gas called a
planet. Creates
tides and
eclipses.
Moons come in many colors, but that of Earth is grey.
A moon and a natural satellite are not the same thing; Earth's moon is not a true satellite since the barycenter of the Earth-Moon system is outside of the Earth.
Also, to moon someone is to expose one's buttocks to them as a joke or a sign of scorn.