Since the Moon is very close to us and orbits the Earth approximately once a month (as opposed to the outer planets which take many years to orbit the Sun), it appears to move relatively very quickly against the stellar background.
(the Moon; is; very close to us) (the Moon; orbits; the Earth; T:approximately once a month) (it; to move relatively very quickly; ) (the outer planets; take; many years)
the Moon the Moon it the outer planets
is orbits to move relatively very quickly take
very close to us
the Earth T:approximately once a month
many years