Is there any reason you aren't seeking the Bachelor's degree straight away?
Is the Bachelor's you are looking for a Bachelor's of Science in Astronomy and Astrophysics?
I would suggest, after doing some research, either an Associates in Science/General Science, or Applied Science. However, I would contact the guidance counsellor at your community college, and inquire as to how the degree with transfer to the four-year university. Some AAS (Associates in Applied Science) do not transfer well to universities or colleges offering Bachelor's.
I would furthermore suggest taking a science related degree over a Liberal Arts degree as some of your courses may transfer and therefore make your stay at university shorter. (For example, if I took an Associates Degree in Accounting I could transfer to a BBA with a Major in Accounting and it would only be three years, or two and a half, depending on the instituition - at least, in Canada, with a three-year advanced diploma, which is similar to an Associates Degree).