How long is a day on Mars?

24 hours, 37 minutes and 22.663 seconds.

The average length of a sidereal day on Mars is 24 hours, 37 minutes and 22.663 seconds, while the average length of a solar day on Mars is 88,775.4409 seconds or 24 hours, 39 minutes and 35.24409 seconds. Mars is the fourth closest planet to the sun and the second asteroid in the solar system after Mercury. It is one of the four major terrestrial planets in the solar system. The atmosphere of Mars is mainly carbon dioxide (95.3%), which is thin and cold, covered with craters, canyons, sand dunes and gravel, and there is no stable liquid water.

Mars time is calculated according to the rotation of Mars. It begins at the moment when the North Pole of Mars points to the sun, and each revolution is called a Mars Day. It uses the time of Mars Day (marked MST) from1October 1970 1 day 0: 00, which is different from Greenwich Mean Time commonly used on the earth.

The difference between Mars and Earth

1 Different surface colors

The color of the earth is blue in space, of which 7 1% is ocean and 29% is land. Mars has an orange-red appearance and is surrounded by hematite (iron oxide).

2, the environment is different

The earth's atmosphere is mainly composed of nitrogen and oxygen, and a small amount of carbon dioxide and argon, with a stable water source; The atmosphere of Mars is mainly carbon dioxide, which is thin and cold. It is distributed in craters, canyons, sand dunes and gravel, and there is no stable liquid water.

3. Different temperatures

The temperature of the earth's surface is influenced by solar radiation, and the global average surface temperature is about 15℃. In the deep underground without sunlight, the temperature is mainly affected by geothermal energy and increases with the increase of depth; Mars' orbit is elliptical, so the temperature difference between perihelion and apohelion is close to 160 degrees Celsius, and the average temperature is 2 18K (kelvin, degrees-days).

The above contents refer to Baidu Encyclopedia-Mars.