Neptune is the 8th planet from the Sun located between Saturn and Uranus. It is nearly the same size as Uranus, making it the 4th largest planet. Neptune has a mass 17 times greater than Earth and a volume 57 times greater than Earth. The planet has a blue color due to its atmosphere being made up primarily of methane gas. Neptune is very cold as it is far from the Sun and composed of ice and gas. It takes Neptune 165 Earth years to orbit the Sun and has a day length of 16 hours and 6.7 minutes. Neptune has 8 moons, the largest being Triton.