I am currently majoring in astrophysics as an undergrad, but my eventual goal is to have a masters or PhD in planetary science. I'm at the point of the course ladder where I've finished up the vanilla physics and math prereqs in order to start on my major specific courses. Long story short, I can still switch to geology/geosciences without having to back track. My main question is should I stick with astrophysics, switch to geology, or grind out a double major in both in order to be eligible for planetary science grad school? I'm having problems finding any concrete information on the subject and emailed CIPS at Berkeley and haven't gotten a response. Thanks in advance for any advice.