Hello, welcome to the encyclopedia. Today we are going to talk about " Uranus ".
Uranus is one of the eight planets in the solar system, and its distance to the sun ranks seventh in the solar system.
distance from the sun 19 astronomical units . rotation period is about 0.7 days, and revolution period is about 84 years. gas planet is blue-green, has a volume of 65 times that of the earth, a mass of 14.5 times that of the earth, and a surface temperature of -226℃.
Its volume ranks third in the solar system and fourth in mass, almost lying horizontally around the sun. Uranus is the first planet to be discovered using a telescope. William Herschel discovered this planet in his own courtyard on March 13, 1781. Uranus and Neptune The internal is different from the larger gas planets of , astronomers set up the ice giant category to define them. Uranus has 27 known natural satellites, 5 of which are larger in scale, and there are 13 relatively weak planetary rings .
In ancient times, people were familiar with the five planets (Mercury, Venus, Mars , Jupiter , Saturn ), and compared with them, the brightness of Uranus is also visible to the naked eye. However, Uranus is darker in brightness and slow orbiting speed. Because the telescope's observation ability was insufficient at that time, it was recognized by ancient observers as a star. Uranus has been observed many times before it was discovered as a planet, but it is regarded as a star.
It is speculated that it may contain rich heavy elements inside. The mantle is made up of ice of methane and ammonia, which may contain water. The core is composed of ice and rock. Uranus is the coldest planet in the solar system atmospheric temperature, with a minimum temperature of -226℃.
The main components of Uranus' atmosphere are hydrogen, helium and methane, which contain about 83% hydrogen, 15% helium and 2% methane. Uranus looks blue-green because the methane in its outer atmosphere has a strong absorption of red and orange light in sunlight. In this way, the main components of sunlight reflected by the atmosphere are blue and green light, and Uranus looks like blue and green. Uranus is beautiful because it also has a known halo of 13 layer, the brightest one is called the Epsilon halo. Uranus' halo is another planetary halo after the discovery of Saturn's halo. From this we know that halo is a universal feature of planets, not just unique to Saturn.
Uranus' equatorial plane is almost perpendicular to the orbital plane, which makes it "lying" regardless of whether it is rotation or rotation. Some people speculate that Uranus became what it is now after being knocked down by another celestial body a long time ago. Uranus is like a cheating child lying on the ground and rolling on the orbit, while orbiting the sun. The result of such movement makes the alternating day and night of Uranus and the changes of the four seasons very strange and complex. The sun takes turns to shine on the Arctic, Equator, South Pole, and Equator. Therefore, every day and every night in most areas on Uranus will last for 42 years (Uranus will take 84 years to rotate once.
Uranus is like a big ice hockey, with a central temperature of only 2000℃~3000℃, which is far lower than other planets, so the interior of Uranus cannot provide it with enough heat energy. In addition, Uranus is very far from the sun and receives very little solar radiation, so its surface temperature is very low. Ground observations show that the air pressure in the upper atmosphere of Uranus is equivalent to 0.4 Earth's atmosphere, and the temperature is only -214℃. Even in the "summer season " exposed to sunlight, Uranus is very cold. The surface of Uranus is also covered with a thick layer of ice, which makes it only absorbs very little sun energy and becomes an extremely cold planet. In addition, the blue-green Uranus has a halo and looks very beautiful, so we are used to refer to Uranus as the "cold beauty" in the planets of the solar system.
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