In our solar system, the planet that has only one moon is Earth. Unlike other planets such as Jupiter and Saturn, which have dozens of moons, Earth has a singular natural satellite, commonly referred to as the Moon.
The Moon plays a crucial role in various Earth systems, including influencing tides due to its gravitational pull, stabilizing Earth's axial tilt, which helps maintain a relatively stable climate, and serving as a site for human exploration.
While other terrestrial planets like Mars have two small moons, and gas giants like Neptune and Uranus have many, Earth’s Moon is unique in its size relative to its planet and the impact it has on our environment.
In summary, Earth is the only planet in our solar system with just one moon, making it a significant feature of our planet's identity and environment.