There are two main types of satellites:

* Natural Satellites: These are also called moons. They are celestial bodies that orbit a planet due to its gravitational pull. For example, the Earth has one moon, while Jupiter has 79.

* Artificial Satellites: These are human-made objects launched into space to orbit a planet. They serve various purposes, such as communication, navigation, weather forecasting, and scientific research.

So, to answer your question directly, moons are the primary heavenly bodies that revolve around a planet.