The only planet with one moon is Earth.
The smallest planet is Mercury but it doesn't have any moons.
Pluto
The Earth is the only planet in our Solar System with one Moon
Only Earth has exactly one moon.
The planet Mercury is not only the smallest of the terrestrial planets in our Solar system, but it is also the one closest to the Sun.
Within our Solar System, the Earth is the only planet with one moon.
Only Earth has exactly one moon.
none of them have more than 1 moon
jupiter
Earth
Well no outer planet has only one moon they all either have more than 1 or none at all.
Earth is the only planet with one moon. Pluto use to be classified as a planet. It had only one discovered moon for a while, but astronomers have since found more moons belonging to Pluto.
Earth is the only planet with just one known moon.