A weird thing about astronomy is that one of the hardest things in the entire Universe to understand is the Milky Way galaxy.
It’s like knowing a lot about your neighborhood, the nearby city, and even your state, but not really knowing much about your own house.
To be fair, it’s like trying to understand your house but not being allowed to leave your closet. We’re inside the Milky Way, stuck about halfway out from the center, and everything we learn about it we learn from right here. The good news is we humans are really, really clever.