What makes Neptune blue?

Neptune is covered with a blue ocean of liquid methane gas. It is a very cold place, its surface temperature drops to -210 degrees celcius. Neptune is made of Hydrogen, Helium and Methane, and probably has a rocky core. It takes an amazing 164.8 years to travel just once around the sun. Neptune was first identified in 1846 when astronamers found that an unidentified planet was disturbing the orbit of Uranus. Neptune has huge storms and one of these, the Great Dark Spot, was larger than the earth.