Of the 14 satellites of Neptune, the largest is Triton, which is in a retrograde (backward) orbit around the planet. Triton is the largest moon in the solar system to do this. On July 15, a 14th moon of Neptune, provisionally called S/2004 N 1, was announced. Neptune has seven inner moons. read more
Neptune Facts Neptune is the eighth planet from the Sun and last of the known planets. While it is the third largest planet with respect to mass, it is only the fourth largest in terms of diameter. read more