<human>:  What is the difference between astronomy and astrophysics?
<bot>: The main difference between astronomy and astrophysics is that astronomy is focused on observing the objects and phenomena in the universe, while astrophysics is focused on explaining and understanding these same objects and phenomena through principles of physics. Astronomy is essentially the study of how the universe works, while astrophysics takes the knowledge gained through astronomy and applies physical principles to understand the behavior of the stars, planets, galaxies, and the universe as a whole.