What efforts have humans made in the exploration of Mars?

After years of observation and research, we know that this "neighbor" is the fourth planet in the solar system from the inside out, belonging to the earth-like planet, and its diameter is half that of the earth. Due to the axial tilt, the rotation period is almost the same, and it takes twice as long to make a turn. The orange appearance is caused by hematite (iron oxide) on the surface. Mars is basically a desert planet with sand dunes and gravel on its surface and no stable liquid water body. The atmosphere dominated by carbon dioxide is thin and cold, and dust is suspended in it, and dust storms often occur every year. The poles of Mars have polar caps composed of water ice and dry ice, which will fluctuate with the seasons. Mars and the earth have many similarities. For example, a day on earth is 23 hours and 56 minutes, and Mars is 24 hours and 37 minutes, almost the same day and night; The included angle between the Earth's orbital plane and the equatorial plane is 23 degrees and 27 minutes, and the included angle between the Mars orbital plane is 25 degrees 1 1 minute. They have almost the same seasonal variation. These similarities show that Mars is the best candidate for human beings to move into space. Therefore, all countries have stepped up their plans to explore Mars and can't wait to visit this close neighbor. Visiting a Neighbor-Visiting a Neighbor-Visiting a Neighbor-Exploring Mars-Curiosity about Mars has prompted human beings to try to knock on this neighbor's door again and again, but unfortunately, so far, we only stand outside the door and deal with video walkie-talkies. 1962, the Soviet union launched the Mars-1 probe, which lost contact with the ground when it flew away from the earth1100,000 kilometers, and its whereabouts were unknown thereafter. This is considered to be the beginning of Mars exploration. It's like the road to "flying to Mars" was doomed from the beginning. The Soviet Union's "Mars" series failed again and again and lost contact with the earth until "Mars V" succeeded. 1965, American mariner 4 flew close to Mars and took 2 1 photo at a distance of 0/000 km from Mars. It is found that there are a large number of craters on Mars, and the atmospheric density is only 1% of that of the earth.

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