Pluto

The planet Pluto is named after the Roman god of the underworld. In Greek mythology, he is known as Hades, ruler of the underworld. The planet was named after such a deity because it is very far away from the Sun, and thus in perpetual darkness. Pluto – which is smaller than Earth’s Moon – has a heart-shaped glacier that’s the size of Texas and Oklahoma. This fascinating world has blue skies, spinning moons, mountains as high as the Rockies, and it snows – but the snow is red.