Scientists conservatively believe that it will take 800 years for human beings to immigrate to Mars. Why do they have to wait for so many years?

Because even an unmanned probe landing on Mars is difficult to achieve today. According to Pang Zhihao, 197 1 year, the Soviet "Mars III" became the first probe to reach the surface of Mars, but it only sent a TV signal for 20 seconds; In 2003, the British Beagle 2 lander lost contact with the Earth during its landing on Mars. 20 16 the "Xia Parelli" lander jointly developed by Europe and Russia broke down during landing on Mars.

Specifically, the biggest obstacle to the "conquest" of Mars is the landing speed. The speed of the Mars probe entering the Martian atmosphere is about 2 1000 km per hour. However, it is still the key factor with the greatest technical difficulty and the highest failure rate to reduce its speed to zero in a controlled state within 7 minutes and achieve a safe landing on Mars.

Due to the long communication delay, it is necessary to inject data to control the flight of the detector in advance. Moreover, in the process of the probe cutting into the orbit of Mars, if the entry point is too far away from Mars to be captured by the gravity of Mars, the probe will be "lost" in the solar system; If the entry point is too close to Mars, it may hit the Martian atmosphere.

In addition, if the probe is to land on the surface of Mars, the difficulty will increase. Because the probe is far away from the earth when it enters the atmosphere of Mars, the measurement and control signal is very weak; When the probe moves to the back of Mars, it is even more difficult to accurately determine its orbital parameters on Earth. We should know that when the probe enters the atmosphere of Mars, whether its thermal protection measures, parachutes, airbags and buffer rockets can work according to procedures is the key to successful landing and must be very accurate.