Earth
Well no outer planet has only one moon they all either have more than 1 or none at all.
The Earth is the only planet in our Solar System with one Moon
The only planet with one moon is Earth. The smallest planet is Mercury but it doesn't have any moons.
Earth is the major planet in our solar system that has only one moon, which is called the Moon.
Only Earth has exactly one moon.
No known planet does. Earth is the only planet in the solar system to have only one moon, but it is one of the largest moons in the solar system. Mars has two tiny moons named Phobos and Deimos. The giant planets of the outer solar system all have an assortment of moons big and small.
Within our Solar System, the Earth is the only planet with one moon.
Only Earth has exactly one moon.
The Earth has only one moon. Early in the planet's history, it is likely that it had many moons. IN fact, back in the 1890's, an astronomer claimed to have discovered a new, tiny moon of the Earth. But he was wrong.
Many planets have only one moon. For example, Earth only has one moon. There are likely to be billions of planets in our universe with just one moon. As you can imagine, the list of these would take a long time to write out. We will only have discovered a small amount of actual planets that fit this description though.
jupiter
No known planets have only one moon other than earth.