[Kate*]

I know nothing about astrophysics or astrobiology, but I'm guessing you'd be looking at a fairly high degree to enter that. To become a detective, you'd have to be a police officer first (I think), and market research would probably be the easiest on that list to enter into. That doesn't mean the others aren't possible, they would just take longer. Also, go to job websites and read the requirements for the kinds of jobs you want to get an idea of what credentials or experience you would need to eventually get hired somewhere. You have plenty of time though.