Uranus

Uranus has the coldest atmosphere in the Solar System.

**Location:** Milky Way Galaxy/Local Cavity/Solar System

**World Category:** Hydrogen-Helium Gas Giant

**Uranus** is the seventh planet from the Sol. Its name is a reference to the Greek god of the sky, Uranus. Uranus' 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. It has the coldest planetary atmosphere in the Solar System, with a minimum temperature of 49 K (−224 °C; −371 °F), and has a complex, layered cloud structure with water thought to make up the lowest clouds and methane the uppermost layer of clouds. The interior of Uranus is mainly composed of ices and rock.

Due to the importance of having multiple reliable Helium-3 sources and the planets low gravity well, it has been the site of major development for Helium-3 mining facilities. Uranus sector is the 3rd largest producer of Helium-3 for the Federation after Jupiter and Saturn. Uranus is also famous for Miranda's tourism park, which attracts many people who wants to try a fall from Verona Rupes, the tallest cliff in the local cluster of the Milky Way Galaxy with a height of 23 km.

Uranus is under the rule of Autonomous Government of Uranus, an EUSI created government and an ally to Earth.

## Planetary Properties

### Physical characteristics

Uranus's mass is roughly 14.5 times that of Earth, making it the least massive of the giant planets. Its diameter is slightly larger than Neptune's at roughly four times that of Earth. Uranus is made primarily of various ices, such as water, ammonia, and methane. The total mass of ice in Uranus's interior is about 9.9 Earth masses. Hydrogen and helium constitute only a small part of the total, with 1.5 Earth masses. The remainder of the non-ice mass (3.1 Earth masses) is accounted for by rocky material.

### Natural Satellites

Uranus has 29 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 Uranian satellite system is the least massive among those of the giant planets; the combined mass of the five major satellites would be less than half that of Triton (largest moon of Neptune) alone. The largest of Uranus's satellites, Titania, has a radius of only 788.9 km (490.2 mi), or less than half that of the Moon, but slightly more than Rhea, the second-largest satellite of Saturn, making Titania the eighth-largest moon in the Solar System. They are ice–rock conglomerates composed of roughly 50% ice and 50% rock. The ice include ammonia and carbon dioxide.

## Colonial Development

Colonization of Uranus began late compared to the larger gas giants of the Solar System. After the fall of Jupiter, Earth turned its attention to other gas giants of the system and Uranus got colonized during this era. First colony in Uranus was a small outpost on Titania which was established in 2178, but the importance of having reliable Heliem-3 sources for Earth made Uranus an important part of the colonial developments. Due to danger of the Mavors Imperium and to better administrate this sector, EUSI put up a collaborationist government in this sector called Autonomous Government of Uranus, which became the Earth's most important ally.

Today Autonomous Government of Uranus rules over 300 million people across Uranus sector and more than 2 billion across the Galaxy and is considered a powerhouse throughout the Milky Way. Autonomous Government of Uranus is a member of the Federation.