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Planet Uranus is the seventh planet from the Sun, being one of the four gaseous planets in the Solar System. It has a composition of gases such as hydrogen and helium, as well as various "ices" such as water, ammonia and methane, as well as traces of hydrocarbons. It is known for its extensive series of rings that surround its surface, totaling 13. The planet also has 27 moons already identified. A peculiar feature of Uranus is its 84-year translational motion. It has the coldest atmosphere in the Solar System, with minimum temperatures of 49 K (–224 °C). Its blue color is a result of absorption of red light by methane in the upper atmosphere.