Hey guys! I'm in high school right now, going to Year 12 (British curriculum). I'll have to start applying to universities in a while. I want to become an astrophysicist; do a PhD in astrophysics. I have a few questions: 1- For my Bachelor's degree, should I do a course in Physics or Mechanical Engineering? (I prefer physics, but I'd like to know which would be more beneficial) 2- For my Master's degree, Physics for sure, but other opinions are welcome. 3- When do I pick which field of astrophysics I would like to work on or specialise on; before my PhD (after my Master's), or after my PhD (before I get a job)?