Venus is very close to the earth. Why do we humans seldom explore Venus?

Venus has a bad surface condition and its detection value is far less than that of Mars.

Venus has a diameter of 95% of the Earth's and an orbital radius of 0.725 astronomical units. The diameter of Mars is 53% of the diameter of the Earth, and its orbital radius is 1.52 astronomical unit. On the surface, the conditions of Venus and Earth should be closer.

Moreover, Venus belongs to the inner planet, and the spacecraft on the earth can go to Venus with the help of the sun's gravity after leaving the earth's gravity; However, humans have rarely explored Venus now, but the more they explore Mars, the more frequent they are.

In fact, before the 1990s, among the extraterrestrial probes, there were the most Venus probes and not many Mars probes.

For example, during the Soviet-American hegemony, only the Soviet Union had 14 Venus probes, and the United States launched more Venus probes. Although more than half of the probes failed to achieve the purpose of detection, at that time, people knew more about Venus than Mars.

The data sent back to Earth by the Soviet probe after reaching the surface of Venus shows that the surface temperature of Venus is as high as 450℃ and the pressure is as high as 90 atmospheres. Several Soviet probes that landed on the surface of Venus were soon scrapped. Among them, Venus 13 took a color photo of the surface of Venus for the first time.

After dozens of failures and disappointments, scientists have discovered the surface environment of Venus. The high temperature, high pressure and strong acid in the sky, accompanied by thunder and lightning roar, are not suitable for life at all, nor for human detectors to land.

Therefore, after the 1990s, both the United States and Russia reduced their exploration of Venus. Russia drastically reduced its projects in the space field for economic reasons, while the United States maintained its absolute superiority in the space field, and then turned its goal to Mars.

Later, NASA sent many probes to Mars. Landed on Mars are: Sojourner Rover (1997), Rover (2003), Spirit (2004), Opportunity (2004), Curiosity (20 12) and Insight (20655).

In addition, NASA also plans to launch a more advanced Mars probe in 2020, and may even carry a Mars helicopter. It can be seen that the United States is very optimistic about Mars.

In the long run, the gravity of Mars is only one third of that of the Earth, which is very suitable for the future interstellar migration of human beings and can also be used as a springboard for human beings to get out of the solar system.