Which of the eight planets has no satellites?

When I was a child, I liked to come to the roof to enjoy the cool on a hot night. On a clear and cloudless summer night, the moon hangs in the sky as bright as ever. When we grow up, we know from textbooks that the moon is the natural satellite of the earth, and it and the earth form the earth-moon system, which has been running in the universe for hundreds of millions of years. So, among the eight planets, are there any satellites? Let's get to know each other.

A satellite is a celestial body that periodically orbits a planet in a closed orbit, while a natural satellite refers to a planet that orbits a planet. In the solar system where human beings live, there are at least 160 known natural satellites (including the larger debris that constitutes the planetary ring).

Among the eight planets, Jupiter has the largest number of natural satellites, of which 63 have been confirmed and at least 6 remain to be confirmed. Saturn has the second largest number of natural satellites, with 62 known satellites. The larger satellites in the solar system include the moon of the earth, in addition to Jupiter's four Galileo satellites, namely Io, Europa, Ganymede and Callisto, as well as Saturn's Titan and Neptune's moon Triton. Of the eight planets in the solar system, only Mercury and Venus have no moons of their own.

So why don't Mercury and Venus have their own moons? This is because mercury and venus are much smaller than other planets in the solar system, so their gravity is smaller; They are also the two planets closest to the sun. Compared with other planets, the sun is much more attractive to these two planets.

Therefore, if small stones or stars are far away from Mercury and Venus, they are more easily attracted to and "taken away" by the sun than by Mercury and Venus. And if stones or stars are too close to Mercury and Venus, they may be "torn" by the gravity of the planets. As a result of this dilemma, it is difficult for Mercury and Venus to form their own natural satellites.

Conclusion: Satellites have three characteristics. One is that they don't shine. The second is to run around the planet; The third is to follow the planets around the stars. Natural satellites like the moon can also balance the earth's rotation, stabilize the earth's axis, control tides, observe time and so on; In the eyes of imaginative human beings, the planet has its own satellite, just like having a traveling companion in the space voyage for hundreds of millions of years. In this way, for mercury and venus, it is inevitable to be a little lonely.

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