Make a list of things which are studied in Astrophysics, that while may be in astronomy, is more emphasized in astrophysics than regular astronoy

I'll star... 1)Spaghettification, 2)Quasars.... (You list the rest)

Note:I realize that many things in Astrophysics are studied in astronomy, but i'm talking things that are much more associated with astrophysics. I need Astrophysics stuff to look over. You can look at this question like listing concepts that would be explored if "astrophysics for dummies" was a book.