Venus is the planet that has no natural satellite. Unlike other planets such as Earth and Mars, which have one or two moons, and Jupiter and Saturn, which have dozens of moons, Venus does not have any known natural satellites. The reason for this is still not well understood, but one theory suggests that Venus may have had a moon in the past, but it collided with another object or was ejected from orbit due to gravitational interactions with the sun. However, this theory is still a subject of ongoing research and debate among scientists.