Here's why:

* Astronomy is the oldest science: It involves the study of celestial objects and phenomena. Humans have been observing the sky and pondering its mysteries for millennia.

* Foundation for other space sciences: Astronomy provided the groundwork for understanding the universe, laying the foundation for fields like:

* Astrophysics: The physics of celestial objects and phenomena.

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

* Planetary science: The study of planets, moons, asteroids, and other objects in our solar system.

* Space exploration: The practical application of space science for missions and research.

While space science has evolved into many specialized branches, astronomy remains its fundamental cornerstone.