Search results
Results from the WOW.Com Content Network
The discovery of Uranus also effectively doubled the size of the known Solar System ... It has equatorial and polar radii of 25,559 ± 4 km (15,881.6 ± 2.5 mi ...
For example, if a TNO is incorrectly assumed to have a mass of 3.59 × 10 20 kg based on a radius of 350 km with a density of 2 g/cm 3 but is later discovered to have a radius of only 175 km with a density of 0.5 g/cm 3, its true mass would be only 1.12 × 10 19 kg.
The moons of the trans-Neptunian objects (other than Charon) have not been included, because they appear to follow the normal situation for TNOs rather than the moons of Saturn and Uranus, and become solid at a larger size (900–1000 km diameter, rather than 400 km as for the moons of Saturn and Uranus).
Oberon orbits Uranus at a distance of about 584,000 km, being the farthest from the planet among its five major moons. [e] Oberon's orbit has a small orbital eccentricity and inclination relative to the equator of Uranus. [4] Its orbital period is around 13.5 days, coincident with its rotational period.
The closest approach of Voyager 2 to Ariel was 127,000 km (79,000 mi)—significantly less than the distances to all other Uranian moons except Miranda. [49] The best images of Ariel have a spatial resolution of about 2 km. [ 37 ] They cover about 40% of the surface, but only 35% was photographed with the quality required for geological mapping ...
“The spacecraft saw Uranus in conditions that only occur about 4% of the time.” An image of the planet Uranus taken by the NASA spacecraft Voyager 2 in 1986.
Virtually all known information regarding its geology and geography was obtained during the flyby of Uranus made by Voyager 2 on 25 January 1986, [18] The closest approach of Voyager 2 to Miranda was 29,000 km (18,000 mi)—significantly less than the distances to all other Uranian moons. [19]
It is the coldest planetary atmosphere in the Solar System, with a minimum temperature of 49 K (−224.2 °C), 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 ice and rock.