I'm very fascinated on both things. I want to study Black Holes, Dark Matter and Dark Energy. Stuff like that in the big world of Astrophysics, but I'm also very attracted to particle physics with the ways forces works on atomic scale, and how elementary particles work. I really have a hard time to decide what I want to pursue, and work with in the later years, but does anyone have any experience they might give out? In this case, which of these two topics are the most hot, and rewarding at the moment and which are the most fun? - Jon.