The two branches of science most closely related to your interests are physics and astronomy. Some consider astronomy as a part of physics, but clearly these are the two areas (along with related and supporting mathematics) that you should focus on. Most universities have academic programs in physics and mathematics, and many have programs in astronomy. You should also consider the "Night Sky" app, a 99 cent download for an iPod or Android tablet. This app allows you to point your device in any direction (even downward) and shows the objects visible in that direction in the sky, with labels for prominent objects, and a supporting app ofr an additional 99 cents that will display statistics for any object you center on.