What do you know about the cold of the universe?

The universe is huge. Now each of us lives in the same universe. We may not have time to explore the mysteries of the universe and know very little about it. Let me tell you some cold knowledge about the universe.

Planets that can float as we all know, planets are celestial bodies that move around stars and are spherical, but as the name suggests, planets must be walking celestial bodies. I think everyone knows Saturn. It is one of the eight planets. The origin of its name is because its color is khaki, so it is called Saturn. Saturn's density is very small, less than that of water. You can imagine whether it will float if you put it on water, but Saturn is very big and needs water wider than Saturn to put it down.

The icy Mars is also one of the eight planets. It is called Mars because it is very bright and fiery red. Mars is too far away, so its temperature is extremely low. The average temperature is generally around minus 60 degrees Celsius, and the lowest temperature can reach minus 100 degrees Celsius. It is conceivable that there should be no life on Mars, and even the air will be frozen. The gas on Mars is mainly carbon dioxide, which will freeze because its melting point is higher than that of Mars. Frozen carbon dioxide will be on the surface of Mars, and they will not merge into the air until the temperature on Mars rises above the melting point of carbon dioxide.

Centennial Venus Venus is also one of the eight planets. In ancient times, it was called Taibai Venus. Venus has a high brightness and is the second brightest celestial body. According to our earth, a day is actually the time for the earth to make one revolution, and a year is the time for the earth to make one revolution, that is, the time for the earth to make one revolution around the sun. Venus is wonderful. Venus needs 243 earth days to rotate once, which means that we have lived on the earth for almost a year. If we live on Venus, one day is equivalent to living on the earth for more than a year. Living on Venus for one year is equivalent to living on Earth for hundreds of years. That's why I call him Venus.

Strange Moon The first American to land on the moon by Apollo walked out of the space capsule and left the first footprint on the moon in human history. There will be no wind because there is no atmosphere on the moon. The footprints of American astronauts at that time were estimated to have been preserved for millions of years. That footprint will not deform, let alone disappear, unless the moon is hit by a large number of meteorites, it will remain the same. Crush footprints.