What is Uranus? Tell 1.

Uranus was searched by William Herschel through the telescope system and was discovered on 1 781March 31day. It is the first planet discovered in modern times. In fact, it has been observed many times, but it was mistaken for another star (observed by john flamsteed as early as 1690, but coded as 34 Taurus). Herschel named it "Georgium Sidus" (planet Georgia) to commemorate his benefactor, the infamous king of England: George III; Some people also call Uranus "Herschel".

Because the names of other planets are taken from Greek mythology, Baud first proposed to call them "Uranus" for consistency, but it was not widely used until 1850.

Only one interplanetary probe has been to Uranus, which was completed by Voyager 2 on 19861October 24th.

Most planets always revolve around an axis almost perpendicular to the ecliptic plane, but Uranus' axis is almost parallel to the ecliptic plane. During the exploration of Voyager 2, the south pole of Uranus was almost directly exposed to the sun. This strange fact shows that the polar region of Uranus gets more energy from the sun than its equatorial region. However, the equatorial region of Uranus is still hotter than the polar region. The reason for this is still unknown.

In addition, it either rotates forward at a rotation axis angle greater than 90 degrees or reversely at an inclination angle less than 90 degrees. The problem is that you have to draw a dividing line somewhere, because, for example, whether Venus really rotates in the opposite direction (not the positive direction with an inclination close to 180 degrees) is controversial.

Uranus is basically composed of rocks and all kinds of ice. It only contains 15% hydrogen and some helium (less than Jupiter and Saturn, which are mostly composed of hydrogen). Uranus and Neptune are very similar to Jupiter and Saturn in many ways after removing the huge liquid metal hydrogen shell. Although the core of Uranus is not made of rocks like Jupiter and Saturn, their material distribution is almost the same.

Of the nine planets, Pluto is the farthest from the sun and has the smallest mass. It hobbles in the cold and dark space 5.9 billion kilometers away from the sun, which is very similar to proto, the god of the underworld in Roman mythology. So people call it Pluto, which is the first two letters of the English name of Pluto in astronomy, and the abbreviation of the name of Lovel, an American astronomer who promoted the discovery of Pluto.

Pluto is the latest planet to be discovered. Compared with the discovery of Uranus and Neptune, the discovery of Pluto is "a lot of trouble". Pluto's brightness is very weak, only 15 and so on. Even in the photos taken by large telescopes, it is no different from ordinary stars. Finding it among thousands of stars is like looking for a needle in a haystack.

In the process of searching for Pluto, Lovel, an American astronomer who is an astronomy enthusiast, calculated the position of this unknown planet in detail and searched it carefully with a telescope, which took more than ten years. Until19161.0616 suddenly died.

1925, Lovel's brother donated a large-field photographic telescope with a diameter of 32.5 cm, which provided excellent conditions for continuing the search for new planets.

From 65438 to 0929, the director of Lovel Observatory invited clyde william tombaugh to join the search for unknown planets. They searched and filmed one by one.

A large number of negatives, and carefully check each negative, the work is hard and boring. 193065438+1October 2 1 day, Tang Bo finally found this new planet in the negative of Gemini.