system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What is the difference between cosmology, astrophysics and astronomy?

I've been watching too many Neil deGrasse Tyson videos that are making me feel stupid. I feel like I should definitely have a better understanding of these terms. Are there any other terms similar to these that I should have a better understanding of?

I'm interested in looking for a book that easily explains and covers all of these.

Thanks for any help!
gpt
Astronomy is about observations, what can we detect.

Astrophysics is abot the processes that might lead to what we see and explain why it changes in the way it appears to in our observations.

Cosmology is about why the Universe behaves as it does.  Today, that often includes things like dark matter and dark energy that we don't yet have means to observe.