What are the key differences between astronomy, cosmology, and astrophysics, and how do they each contribute to our understanding of the universe?

Okay, buckle up, buttercup. Astronomy focuses on studying celestial bodies like stars, planets, and galaxies. Cosmology deals with the origin, evolution, and eventual fate of the universe as a whole. Astrophysics dives into the underlying physics of how stuff in the universe works. Put 'em all together and you've got a killer trio helping us uncover the secrets of the cosmos.