The object that revolves around a planet while the planet revolves around the sun is a moon.

Here's why:

* Planets orbit stars: Planets are celestial bodies that orbit a star, like our Sun.

* Moons orbit planets: Moons are natural satellites that orbit planets. For example, our Earth has one moon, while Jupiter has over 70.

So, to summarize:

* Sun: At the center of our solar system.

* Planet: Orbits the Sun.

* Moon: Orbits the planet.