Which constellation in the solar system is the coldest

Uranus is the first planet discovered in modern times. Although its luminosity is the same as that of five traditional planets, its brightness is visible to the naked eye, but because of its dim and slow orbit, ancient observers did not identify it as a planet. Until 178 1 March 13, William? Sir Herschel announced that he had discovered Uranus, thus extending the known boundary for the first time in the modern history of the solar system. This is also the first planet discovered with a telescope. Uranus is the only planet in the solar system that lacks internal heat energy. According to the current structure model of Uranus, its central temperature is only 2000℃ ~ 3000℃, which is much lower than other planets.

Of the nine planets, Uranus is 1 times as far away from the sun as Neptune, but its surface temperature is the same as Neptune's and not much higher than Pluto's. By measuring its radiant energy, we know that only 6% of its radiant energy comes from the interior of the star, while Jupiter, Saturn and Neptune have 40%. It can be seen that Uranus is the only planet in the solar system that lacks internal heat energy. According to the current structure model of Uranus, its central temperature is only 2000℃ ~ 3000℃, which is much lower than other planets. Uranus' atmosphere is mainly composed of hydrogen and helium, and also contains a high proportion of water, ammonia and methane? Ice? (ammonia and methane can only exist in liquid state here), and detectable hydrocarbons. Uranus is the coldest planet in the solar system. Its outer atmosphere has a complex cloud structure, with water in the lowest cloud and methane in the highest cloud. In contrast, the interior of Uranus is composed of ice and rocks. ?

The internal heat of Uranus is obviously lower than that of other woody planets, which makes Uranus the lowest temperature planet in the solar system, even colder than Neptune. There is also a hypothesis that there is a barrier layer in the upper layer of Uranus to prevent internal heat from reaching the surface. For example, convection may only occur between a group of different structures, and heat energy may not be transmitted upward.