The constellation with the lowest surface temperature

According to the concept of nine planets, the coldest temperature of Pluto is between 35 and 45K (-238 to -228℃).

At the international astronomical conference in 2006, Pluto was deleted from the planet. But people are still used to juxtaposing Pluto with the other eight planets as nine planets.

Extended data:

1. Pluto is 2370 kilometers in diameter, which is two-thirds of the diameter of the moon and one-third of the volume; The mass is 1.473× 10 22kg, which is one sixth of the mass of the moon. Pluto has a density of 2.32g/cm3, which is mainly composed of rocks and ice, and the composition is a mixture of 70% rocks and 30% water ice. Bright parts of the earth's surface may be covered with some solid nitrogen and a small amount of solid methane and carbon monoxide.

2. It is not the nine planets now. Pluto has been eliminated from the list of nine planets, and Neptune is the coldest of the remaining eight planets because it is farthest from the sun. Neptune's surface temperature is only -2 18℃, making it the coldest planet.

Reference: Baidu Encyclopedia-Pluto

Baidu encyclopedia-Neptune