Triton is Neptune’s biggest moon, discovered in 1846 by William Lassell. What makes it fascinating is that it orbits backward (called a retrograde orbit), opposite to Neptune’s rotation.

Discover the planet that has the most moons. This planet is a ringed giant and the second largest in the solar system.

From Mercury to Neptune, explore our solar system and learn ... made up of the sun and everything that orbits it — planets, moons, asteroids, comets, and even dust and gas.

Jupiter’s four largest moons – Io, Europa ... Jupiter has 95, Uranus has 28 and Neptune has 16, for a total of 142 moons. We only need to discover ten more moons around Saturn to give it ...