What's in mercury?

Mercury's atmosphere is very thin, and the atmospheric pressure is less than 2× 10 hectopascals. The atmosphere contains helium, hydrogen, oxygen, carbon, argon, neon, xenon and other elements. Because the atmosphere is very thin.

The temperature on the surface of mercury varies greatly from day to night. In fact, gas molecules in Mercury's atmosphere collide with the surface of Mercury more frequently than with each other. For these reasons, Mercury should be considered as having no atmosphere.

Mercury's atmosphere is very small, mainly composed of helium (42%), sodium (gas) (42%) and oxygen (15%). The daytime temperature is very high, with an average surface temperature of 179℃, with the highest of 427℃ and the lowest of 173℃.

Extended data:

The average surface temperature of Mercury is about 452K, ranging from 90 K to 700 K, and it is the planet with the largest temperature difference. During the day, the temperature under direct sunlight is as high as 427℃.

When there is no sunlight at night, the temperature drops to-173℃. You can compare the earth, and the temperature change on the earth is only 1 1K (this is only solar radiation energy, regardless of "season" and "weather").

The sunshine on the surface of Mercury is 8.9 times stronger than that on the Earth, and the total irradiance is 9 126.6W/㎡. The surface of mercury has been hit by countless meteorites, and there are potholes everywhere.

Baidu Encyclopedia-Mercury