Neptune - The Blue Planet

Neptune, which was named after the Roman god of the sea, is a planet of blue. Its atmosphere consists of methane, hydrogen, helium, and water. It has very strong wind. The wind velocity could reach to 2100 kilometers per hour, which is almost supersonic. Though the name is ironically correct, the planet is as blue as sapphire. However, scientisits still do not understand completely why it is so blue!