After speeding through space for 12 years and almost 3 billion miles, Voyager whizzed past Neptune on August 25, 1989. The spacecraft noted that Neptune has 2 bright outer rings, a weaker inner ring, and a thin ring of dust. However, there may be 5 rings - no one is sure of the exact number. We do know that the rings are made of tiny frozen bits of matter. Neptune has at least 8 satellites or moons.
Triton is the name of the biggest moon.
In fact, Triton is nearly the same size as our own moon. Scientists seem to think that Triton must be a very strange place. One reason is that Triton is colder than any other object ever measured in the Solar System. This moon has active ICE volcanoes. These volcanoes, when they erupt, shoot nitrogen ice and gas about 25 miles high.