Descriptive text describing Mars

The description of Mars is as follows:

Mars is the most suitable planet for human habitation except the earth at present, with a diameter of 1000 km, which is about half that of the earth. Although Mars has two satellites, they are not as big as the moon, and because of the lack of gravity and small size, the two satellites look like giant potatoes in outer space, covered with dust at least one meter thick.

Mars sounds hot, but it's actually very cold. In summer, it is 25℃ in the morning and suddenly drops to-125℃ at night. It will be colder in winter. Mars, like the earth, has two poles, mainly made of dry ice (frozen carbon dioxide). Even in summer, it will be as low as-100℃

There is also a worse natural phenomenon on Mars, that is, sandstorm. The wind on Mars is very strong, and the wind speed can reach 400 kilometers per hour. This is equivalent to all the substances on the earth being blown away. The dust carried by the wind can reach the height of 1000 meters. It can cover most areas and last for months.

A brief history of human exploration of Mars;

1 962 1 65438+1in October, the Soviet union launched the "Mars1"probe, and lost contact with the ground when it flew away from the earth1100 million kilometers. It is regarded as the beginning of human exploration of Mars.

1964165438+1On October 28th, the United States launched the Mariner 4 probe and successfully made its first flight to Mars on July 6th. 1965. Its nearest distance to Mars is 9846 kilometers, and it took and sent back 2 1 photo. It is found that there are a large number of craters on Mars, and the atmospheric density is 1% of that of the earth. The probe was lost on1967 65438+February 2 1.

During 1969, American Mariner 5 and Mariner 6 flew over the surface of Mars and took more than 200 photos, showing the unexpected low temperature and carbon dioxide concentration on the surface of Mars. In the same year, Mariner 7 also sent back 126 photos.

1971may, the Soviet union launched the mars 3 probe. June 5438+February of that year, we lost contact with the ground after encountering a sandstorm on Mars.

1972, American mariner 9 became the first Mars satellite. It has been flying in the orbit of Mars for a long time, and successfully photographed the whole picture of Mars, taking a total of 7329 photos of Mars, showing the face of Mars. 1 In August 1975, the American Viking1probe was launched, and in July 1976,/kloc-0 successfully landed on Mars and sent back color photos.