planet Uranus in 4 times and 14.5 times the mass of Earth, and 390 times fainter than the sun illuminated.It is a group of planets called gas giants.Moreover - this is one of the two ice giants nearest space.The main components of its atmosphere are hydrogen and helium is present in a quantity as carbon, methane and others. Contaminants.That methane gives the planet azure-green color.
clouds of Uranus have a complex, layered structure.The upper layer consists of methane, the main - from frozen sulfide.Below is a second cloud layer consisting of ammonium bisulfate.Even lower - clouds of water ice.It is difficult to determine where the a
tmosphere ends and begins the planet's surface, but the structure of Uranus is still somewhat denser than the other gas giants.
In the center of the planet is a relatively small rocky core and icy mantle consists of modifications of methane, ammonia, helium, hydrogen, and rock.Metallic hydrogen is present in the depths of the other giant planets, Uranus otsutstvuet.Uran has its own magnetic field, whose origin is still unknown, and radiates into space much more heat than it receives from the sun.
Uranus - the coldest planet in the solar system.The minimum temperature is recorded - 224 ° C.The planet's atmosphere observed powerful and lasting storm, with wind speeds reaching 900 km / h.
Movement Uranus takes on a nearly circular orbit.The period of revolution around the Sun - 84 terrestrial years.Uranium has a unique feature - the axis of rotation away from the plane of the orbit is only about 8 °.Planet like, rolling around the sun, swaying from side to side.Another feature of Uranus - retrograde or inverse daily rotation.So in the solar system, except it only rotates Venus.Day on Uranus are 17 hours and 14 minutes.
a result of all this, Uranus established an unusual change of seasons.The change of seasons at the poles and the equator of the planet takes place in different ways.At the equator of Uranus during the year is 2 summer and 2 winter.The duration of each period - almost 21 years old.At the poles - one winter and one summer period of 42 Earth years.In periods of equinox in a small zone near the equatorial region of the planet, there is a regular day and night.
system of rings and moons of Uranus
Uranus has 13 thin dark rings - 9 core, 2 and 2 external dust formed later inland.The first 11 spaced 40 000-50 000 km.The outer ring, open in 2005, located about 2 times more basic, and constitute a separate system.The thickness of the rings does not exceed 1 km.Between the main rings are observed incomplete arcs and dusty strip.
central ring width is 100 km, it is the most significant in magnitude.The rings of Uranus are opaque, and consist of a mixture of ice and some dark material.It is assumed that the age of the ring system is not more than 600 million. S.Perhaps it originated in a collision and the destruction of the satellites of the planet orbiting around it or captured as a result of gravitational interaction.
planes of the orbits of 27 satellites of Uranus are virtually identical with the equatorial plane of the planet.None of them does not have the atmosphere and does not reach the size of small planets.Satellites inner group, are fragments of irregular shape, dimensions of 50 - 150 km.All these overfly Uranium for several hours.The orbits of the inner satellites are changing rapidly.Perhaps they are the suppliers of materials for the planet's rings.
The largest are the main satellites.Their 5. The diameter of the largest of them - Titania - 1158 km.Main satellites are composed of ice and rock.The third group - foreign satellites - have a reverse rotation, small size and orbit, have a significant angle of inclination to the equatorial plane of the planet.The largest - Ferdinind - makes one orbit around Uranus for 8 years.Probably all of them captured by the gravitational field of the planet from space.