Deep-sky object
Any astronomical object that is not an individual star / From Wikipedia, the free encyclopedia
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"Deep sky" redirects here. For the racehorse, see Deep Sky (horse). For the 2023 documentary, see Deep Sky. For the band, see Deepsky.
A deep-sky object (DSO) is any astronomical object that is not an individual star or Solar System object (such as Sun, Moon, planet, comet, etc.).[1][2] The classification is used for the most part by amateur astronomers to denote visually observed faint naked eye and telescopic objects such as star clusters, nebulae and galaxies. This distinction is practical and technical, implying a variety of instruments and techniques appropriate to observation, and does not distinguish the nature of the object itself.