The scientist who studies the Sun, Moon, and stars is called an astronomer.

Astronomers use telescopes and other instruments to observe and study celestial objects and phenomena. They explore topics such as:

* The formation and evolution of stars, planets, and galaxies

* The composition and properties of celestial objects

* The motion and interactions of celestial objects

* The search for life beyond Earth

So, if you're interested in the mysteries of the universe, astronomy might be the field for you!