Many planets in the solar system have natural satellites. But Earth and its natural satellite share a special relationship.
The Moon is Earth’s only natural satellite. Though our Moon is small when compared to the moons of Jupiter or Saturn, its size in relation to that of Earth is quite large.
Along with revolving around the Earth, the Moon also revolves around the Sun in sync with the Earth. They look more like two sister planets than a planet and its satellite.
Therefore, together, the Earth and the Moon are considered as a double planetary system.
Picture Credit : Google