Editing Deep-sky object (section)

{{Short description|Any astronomical object that is not an individual star}}
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[[File:Orion 3008 huge (detail).jpg|thumb|250px|Several nebulae in the [[constellation]] [[Orion (constellation)|Orion]] commonly called ''deep-sky objects'']]

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.).<ref>{{cite book|author=Fred Schaaf|title=40 Nights to Knowing the Sky: A Night-by-Night Sky-Watching Primer|url=https://books.google.com/books?id=wcoRISdUnu4C&pg=RA1-PA13|year=1998|publisher=Henry Holt and Company|isbn=978-0-8050-4668-7|page=113}}</ref><ref>{{cite book|author=Ian Ridpath|title=The Illustrated Encyclopedia of the Universe|url=https://books.google.com/books?id=0IUTwSFOtY4C&pg=PT263|year=2001|publisher=Watson-Guptill Publications|isbn=978-0-8230-2512-1|page=273}}</ref> The classification is used for the most part by [[amateur astronomer]]s to denote visually observed faint naked eye and [[Optical telescope|telescopic]] objects such as [[star cluster]]s, [[nebula]]e and [[galaxy|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.