According to current human understanding, most of the eight planets in the solar system have satellites orbiting them, and the number of satellites each planet has is not the same, or even very different.

As we all know, the total number of known satellites in our solar system is 205. Earth has 1 satellite, the Moon; Mars has 2 satellites; Neptune has 14 satellites; Uranus has 27 satellites; Jupiter has 79 satellites; and Saturn has 82 satellites.

However, among the eight planets in the beautiful solar system, there are two planets without satellites. They are called the "loneliest" planets in the solar system. So, which two are they? Of course, they are the planets we know as Mercury and Venus.

This raises the question: why are Mercury and Venus the only planets without satellites?

First, let's take a look at the locations of Mercury and Venus in the solar system. In the solar system, the planets in order from the position closest to the sun to the outside are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

We know that the sun plays an important role in the solar system. The sun gathers 99.8% of the visible matter in the solar system. Its gravitational field can control the entire solar system. Of course, the closer a celestial body is to the sun, the stronger the gravitational pull it will receive, and the farther away from the sun it is, the stronger the gravitational pull will be. The weaker the impact.

This suggests that Mercury and Venus lack satellites because they are too close to the sun. If satellites are orbiting them, then these satellites will also be affected by the strong gravitational pull of the sun at the same time. In the process of orbiting the planet, the satellite will be gradually pulled away from its original position by the sun's gravitational field due to the influence of the sun's strong gravitational field.

Therefore, the orbits of the satellites orbiting Mercury and Venus will become very unstable. After a long time, the satellites are likely to be attracted by the sun, so it will be difficult for Mercury and Venus to have their satellites.

This raises the question: have Mercury and Venus never had satellites since their formation?

But in fact, Venus was not "lonely" in the past. People discovered a satellite of Venus in 1686, but due to limited technology at the time, further exploration was not possible. What is surprising is that later, human technology developed Well, when we tried to detect Venus again, it turned out that the satellite was gone.

Some question whether the original discovery was mistaken. After hundreds of years, the truth remains uncertain, and the matter remains unresolved.