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"Deep-sky objects" as a book category groups works focused on celestial phenomena beyond the solar system—nebulae, star clusters, galaxies, quasars and other extragalactic or interstellar targets—and the science, observation and imagery that surround them. Titles range from field guides and observing manuals for amateur astronomers and astrophotographers to popular-science explanations of stellar evolution and cosmology, technical reference catalogues and visually rich coffee-table books. The category can also include historical and cultural perspectives on how these objects have shaped astronomy, and occasionally science fiction inspired by the grandeur and mystery of the deep sky.

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