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Astrophysics spans more orders of magnitude in space, time, and mass than any other science, and the first 3 lectures of this course provide a unifying structure to help comprehend the vast range of. We explore these properties of the Universe in our Department of Astrophysical Sciences at Princeton. We research these topics using both observational and data-analysis tools, as well as. Uploaded by on. Introduction to Astrophysics plunges you into this exciting quest, taking you step by step through the calculations that show how planets, stars, and galaxies work.