Voyager took this picture as it was leaving Neptune, so the Sun is behind the rings, which is what made it possible for us to see them. Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, Triton, Nereid Neptune's Moon Triton Neptune has eight moons that we know about and there may be more. There are only two that we can see from Earth. One of them is Triton. The family of moons surrounding Neptune is unusual because Triton, the largest, is over 1,600 miles in diameter and the rest of them are tiny, some as small as twenty miles in diameter.
Triton is one of the most unusual bodies in our solar system.
You will notice that the left half of Triton is smooth, while the right half appears to be very rough. The smooth half is covered by ice, while the right half is a rocky surface. Triton is also the coldest body we know of in the solar system. The temperature on its surface is over four hundred degrees below zero. Geysers on Triton Triton was the last solid object Voyager would see before it left our solar system.