The outer planets
are orbited by
many moons. Saturn
and Jupiter have
more than sixty
moons each.In
addition, the moon's
surface is covered
in craters caused
by the impact
of asteriods and
the comets. The
average length of
the Moon's orbit
is 29.5 days. The
Moon probably has
a solid core, however
we do not know
for sure. In addition,
The dark side of
the Moon cannot
be seen from the
Earth. It was first
photographed by
a Russian space
probe in 1959.