I'm currently looking into a career in either Astrophysics, Theoretical Physics, or Theoretical Astrophysics. What is the difference between the subject matter in each of these three fields and how would I go about attaining status of Theoretical Astrophysicist? I have found numerous majors for both Astrophysics and Theoretical Physics, but I have not found any majors for Theoretical Astrophysics. I find myself drawn to the whacky edges of physics: black holes, dark matter, dark energy, multiverse theory, etc. Which major(s) suits this best?