The study of the heavens, encompassing celestial objects, phenomena, and their movements, is called astronomy.

Here's a breakdown of what astronomy covers:

* Celestial objects: Stars, planets, moons, comets, asteroids, galaxies, nebulae, etc.

* Celestial phenomena: Supernovas, eclipses, meteor showers, gravitational waves, etc.

* Their movements: Orbits, rotations, interactions, etc.

While "astronomy" is the most comprehensive term, related fields include:

* Astrophysics: The study of the physical properties and processes of celestial objects.

* Cosmology: The study of the origin, evolution, and structure of the universe.

* Astrobiology: The study of the possibility of life beyond Earth.

Let me know if you'd like to learn more about any of these fields!