- Uranus is the seventh planet from the Sun.
- Its name is a reference to the Greek god of the sky, Uranus, who, according to Greek mythology, was the great-grandfather of Ares (Mars), grandfather of Zeus (Jupiter) and father of Cronus (Saturn).
- Scientists often classify Uranus and Neptune as “ice giants” to distinguish them from the other giant planets.
- Uranus’s atmosphere is similar to Jupiter‘s and Saturn‘s in its primary composition of hydrogen and helium, but it contains more “ices” such as water, ammonia, and methane, along with traces of other hydrocarbons.
- Uranus has the coldest planetary atmosphere in the Solar System, with a minimum temperature of 49 K (−224 °C; −371 °F),
- It has a complex, layered cloud structure with water thought to make up the lowest clouds and methane the uppermost layer of clouds.
- Uranus has 27 known natural satellites.
- The names of these satellites are chosen from characters in the works of Shakespeare and Alexander Pope. The five main satellites are Miranda, Ariel, Umbriel, Titania, and Oberon.
- The majority of Uranus’s rings are opaque and only a few kilometers wide. The ring system contains little dust overall; it consists mostly of large bodies 20 cm to 20 m in diameter.