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Extractions: CliffsNotes - The Fastest Way to Learn My Cart My Account Help Home ... Sciences Need homework and test-taking help in astronomy and science. These articles can help you learn more about planets, stars, and galaxies. Click the plus sign to view articles in a section, or use the Search box below to find something specific. Search Astronomy Earth Sciences Geology Physics A Brief History of Astronomy The Science of Astronomy Observing the Sky The Solar System Earth and its Moon Properties of Earth and the Moon Interior Structure: Core, Mantle, Crust
