Wikijunior:Solar System/Neptune/Proteus  Proteus from Voyager 2
spacecraft  Proteus is a moon of the planet Neptune. It is
sometimes called Neptune VIII. We still do not know a lot about
this moon, as only a few pictures have been taken when the
Voyager 2 flew by in 1989.  How big is it?Edit  This moon is
uneven in shape and has an average size of just over 400 km
across. This moon is nearly as a big as a satellite can be
without it being pulled into a sphere by its own gravity. Even
though it is a small moon, it is the second largest moon of
Neptune after Triton.  What is its surface like?Edit  The
surface of this moon is covered in craters and some grooves. It
is also a very dark moon, with a ground that is as dark as soot.
It is one of the darkest objects in the Solar System.  How long
is Proteus's revolution?Edit  It takes 1 day, 2 hours, and 56
minutes for this moon to orbit the planet Neptune.  Who is it
named after?Edit  This moon is named for a sea god from ancient
Greek mythology. In some tales he wa