Not long after Neptune completed its first orbit around the sun since its discovery in 1846, scientists have managed to calculate the exact length of one day on the distant gas giant planet.

Orbit around the Sun: It takes 165 Earth years for Neptune to go around the Sun one time. Rotation: It takes Neptune only 16 Earth hours for it to spin on its axis once.

It orbits Neptune in the opposite direction of Neptune's rotation, known as a retrograde ... taking almost 26 Earth years to complete a single orbit of Neptune. Sao: Discovered Aug. 14, 2002, by ...

These moons are all small, low in mass, all orbit in the same plane as Neptune’s rotation, and complete a revolution around Neptune in under 27 hours. They’re incredibly close in to this gas ...

For years, scientists have suspected that Triton wasn't part of Neptune's original collection of moons. The massive moon has a backward orbit, and makes up over 99 percent of all the mass orbiting ...

Discovered in 1846, Triton is the only known large moon in the Solar System with a retrograde orbit, traveling in the opposite direction to the planet’s rotation. This fact indicates that ...

For decades, images taken of Neptune have looked like the planet has a deep blue hue, while Uranus seemed more green. However, these two ice giants may actually look more similar to eachother than ...

Dramatic changes on Uranus, Neptune, Saturn and Jupiter revealed in 10 years of Hubble Telescope images ... but also for tracking long-term atmospheric changes as the planets orbit the sun.