Proteus (moon)
= Proteus (moon)
{wiki=Proteus_(moon)}
Proteus is one of the moons of Neptune and is notable for being the second-largest of Neptune's moons, after Triton. Discovered in 1989 by the Voyager 2 spacecraft during its flyby of Neptune, Proteus is irregularly shaped and is classified as a non-spherical moon, meaning it doesn’t have enough gravitational pull to pull itself into a rounded shape.