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“Astronomy is the study of the universe. Various branches of astronomy include: cosmology, planetary, geology, space plasma physics, and image analysis, amongst others. Astronomy is focused on understanding the fundamental laws of the universe.”
-- Description of the Astronomy Department;from San Diego City College Catalog 2019-2020 (pdf).
Milky Way Galaxy: Atlas Image courtesy of 2MASS/UMass/IPAC-Caltech/NASA/NSF. Public domain.
Total solar eclipse: Barbara Ring, Casper Wyoming, August 21, 2017
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