physics, chemistry, biology, geology, astrology, astronomy, anthropology, sociology, and all the mathematical sciences. you could easily make the argument for any of these things being a science. and that's just off the top of my head.
even if your definition is correct, it's still pretty broad, no? the universe is a big place. there is a lot that needs to be explained. but maybe that isn't what you are thinking of when you say "broad"