- Among the planets in our solar system, Mercury and Venus do not have any natural satellites or moons.

- Both Mercury and Venus are rocky planets, similar to Earth, but they lack any moons in their orbit.

- In contrast, other planets in the solar system have multiple moons. For example, Mars has two moons (Phobos and Deimos), Jupiter has 79 known moons, Saturn has 82 known moons, Uranus has 27 known moons, and Neptune has 14 known moons.