So I'm still in year 12, so I have a couple of months before I have to decide, but I just wanted to know my options early.

Basically, I know that Melbourne is a good choice as far as unis go, esp. if you're doing a degree in science (or so I've heard). However I have no idea what course I should be picking. I wanna go into astrophysics, I've always known that. So people tell me that I should do a Bachelor of Advanced Science, with a major in astronomy, is this the right way to go?

Also, I live in sydney, so is it worth it to move to melbourne for uni, or should I just consider my options here and maybe go to Usyd or Macquarie?