Astronomy 101: Essential concepts in astronomy — the science and the hobby
Even if you only have a casual or passing interest in the science of astronomy, you would not be intimidated by the introductory resources to the subject here at Sky Publishing Corp. 'Did you know you can see a galaxy 2½ million light-years away with your unaided eyes? Craters on the Moon with binoculars? Countless wonders await you any clear night. The first step is simply to look up and ask, "What's that?" When you do, you're taking the first step toward a lifetime of cosmic exploration and enjoyment.'