The planet Uranus.
A mysterious ice giant.
Distance from the Sun: 2,896. 6 million km Diameter of the planet: 51,118 km * Day on the planet: 17h 12min ** Year on the planet: 84.01 years *** t° on the surface: -210°C Atmosphere: 83% hydrogen; 15% helium; 2% methane Satellites: 17.
Diameter at the equator of the planet * * period of rotation around its own axis (in earth days) *** period of orbit around the Sun (in earth days)
The development of optics in modern times led to the fact that on March 13, 1781, the boundaries of the solar system were expanded by the discovery of the planet Uranus, a discovery made by William Herschel.
Presentation: planet Uranus.
This is the seventh planet in the solar system, it has 27 satellites and 13 rings.
The internal structure of Uranium can only be determined indirectly. The mass of the planet, equal to 14.5 earth masses, was determined by scientists after studying the gravitational influence of the planet on the satellites. There is an assumption that in the center of Uranus there is a stone core, which mainly consists of silicon oxides. Its diameter should be 1.5 times the diameter of the earth’s core. Then there should be a shell of ice and rocks, and then an ocean of liquid hydrogen. According to another point of view, Uranus does not have a core at all, and the entire planet is a huge ball of ice and liquid, surrounded by a gas blanket.
Atmosphere and surface.
The atmosphere of Uranus is mainly composed of hydrogen, methane, and water. This is almost the entire main composition of the planet’s interior. The density of Uranus is higher than that of Jupiter or Saturn, with an average of 1.58 g / cm3. This suggests that part of the Uranium consists of helium or has a core consisting of heavy elements.In the atmosphere of Uranus, methane and hydrocarbon are present. Its clouds are made up of solid ice and ammonia.
Satellites of the planet Saturn.
The planet, like the other two major giants Jupiter and Saturn, has its own ring system. They were discovered not so long ago in 1977, quite by accident during a routine observation of an eclipse under Uranus of one of the shining stars. The fact is that the rings of Uranus have an extremely weak ability to reflect light, so no one knew about their presence until that time. Later, the Voyager 2 spacecraft confirmed the presence of a ring system near Uranus.
The satellite planets were discovered much earlier, back in 1787 by the same astronomer William Herschel, who discovered the planet itself. The first two moons discovered are Titania and Oberon. They are the largest moons of the planet, consisting mainly of gray ice. In 1851, British astronomer William Lascelles discovered two more moons – Ariel and Umbriel. and almost 100 years later, in 1948, astronomer Gerald Kuiper found the fifth moon of Uranus, Miranda. Later, the Voyager 2 interplanetary vehicle will detect 13 more satellites of the planet, several more satellites have recently been discovered, so at present 27 satellites of Uranus are already known.
Interesting facts about the planet.
In 1977, an unusual ring system was discovered on Uranus. Their main difference from Saturn’s is that they consist of extremely dark particles. The rings can only be detected when the light from the stars behind them is greatly attenuated.
Uranus has 4 large moons: Titania, Oberon, Ariel b, Umbriel, possibly they have a crust, core and mantle. The size of the planetary system is also unusual, they are very small. The farthest satellite, Oberon, orbits 226,000 km away from the planet, while the closest satellite, Miranda, orbits just 130,000 km away.
This is the only planet in the solar system whose axis has an inclination to the orbit of more than 90 degrees. Accordingly, it turns out that the planet is “lying on its side”. It is believed that this happened due to the collision of a giant with a huge asteroid, which led to the displacement of the poles. Summer at the south pole lasts for 42 earth years, during which time the sun never leaves the sky, while in winter, on the contrary, 42 years of impenetrable darkness reigns.
It is the coldest planet in the solar system, with the lowest recorded temperature of -224°C. On Uranus, constant winds blow, the speed of which varies between 140 – 580 km/h.
Exploring the planet.
The only spacecraft that has reached Uranus is Voyager 2. The data obtained from it was simply amazing, it turns out that the planet has 4 magnetic poles, 2 main and 2 secondary. Temperature measurements were also made at different poles of the planet, which also led scientists to confusion. The temperature on the planet is constant, and differs by about 3-4 degrees. Scientists can not yet explain the reason, but it is believed that this is due to the saturation of the atmosphere with water vapor. Then the movement of air masses in the atmosphere is similar to the earth’s sea currents.
The mysteries of the solar system have not yet been solved, and Uranus is one of its most mysterious representatives. The mass of information received from Voyager 2 only slightly lifted the veil of mystery, but on the other hand, these discoveries led to even more mysteries and questions.