The five planets nearest to the sun were named after their most prominent gods by the Romans. With the exception of Uranus, astronomers opted to keep naming planets after Roman Gods. The planet Uranus was named after the Greek deity of the sky, Uranus. He was Saturn's father and Jupiter's grandpa, according to legend. Uranus is the seventh planet from the Sun and the second-largest planet in the Solar System after Earth. It is also the only planet that is not a solid body but instead is composed of gases inside a gaseous planet. Uranus has one satellite, Miranda, which was confirmed by Voyager 2 in 1979. Uranus is located in the constellation Pisces. It can be seen with the naked eye from southern Europe, North America, and Australia at night, when it is rising in the east and setting in the west. Uranus is almost all hydrogen and helium with some methane present on its outer moon, Ariel. It has an average density about 1.8 times that of water. Although scientists don't know much about what makes up the interior of Uranus, they do know that it must be mostly gas because there is no evidence of a solid core. People have been looking at the stars since ancient times. In fact, the ancient Greeks used astronomy for navigation and timekeeping. But it was Galileo who first saw planets orbiting the Sun in 1610.