Here's why:

* Astronomy is the branch of science that studies celestial objects (like the moon, stars, planets, galaxies) and their properties, movements, and origins.

* Other disciplines might also touch on the moon:

* Geology studies the moon's surface, composition, and formation.

* Physics helps understand the moon's gravitational pull and its interaction with Earth.

* Space exploration involves sending missions to the moon and studying it directly.

But astronomy is the overarching discipline that encompasses all these aspects and more.