If alien civilization comes to the solar system, if it really wants to hide, backward human beings are completely invisible. So there can't be an alien base on the back of the moon. There are alien bases or alien spacecraft on the back of the moon. A lot of information comes from fuzzy photos of the moon. Some terrain on the moon looks a bit strange, so some people think of aliens and things like that. You can see that the back of the moon looks very different from the front, which is related to the long-term flooding of the moon by tides. Because the back of the moon always faces away from the earth, when an asteroid outside the earth-moon system collides, the back of the moon first protrudes and is easy to be hit, so there are a large number of craters on the back of the moon.
Influenced by the strong gravity of the earth, the moon has also paid a certain price. The earth postpones the rotation period to period of revolution around the earth, that is, the tides are fixed. This effect makes people on earth always see only one side of the moon, not the whole back. Therefore, in the process of human exploration of the moon, conspiracy theories and rumors about the back of the moon are rampant. Some science fiction works say that the back of the moon is an alien base. Why is it not true? The most typical representative work about the alien base is the Transformers movie series. In the imagination of these conspiracy theorists, the moon people and aliens are protected by the moon, and the earth people will never find them, and they will angrily push the earth away.
The Soviet Lunar 3 probe circled the moon for the first time and saw the back of the moon. Nothing more special than the front was found. Just more craters, craters and deserts. 1960, the Soviet Union published a complete map of the moon. Since then, American probes have completely verified this research achievement, and Chang 'e 1, 2 and 3 launched by China have also taken photos of the back of the moon. It was not until 1968 that astronauts flew over the back of the moon for the first time. This means that humans have seen the back of the moon with the naked eye, but as unmanned detectors have seen, it is a wasteland.