DEEP SKY OBJECTS
- Deep-sky objects are astronomical objects other than individual stars and solar system objects (such as Sun, Moon, planets, comets, etc.) 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.
Classifying non-stellar astronomical objects began soon after the invention of the telescope.There are many astronomical object types that come under the description of deep-sky objects. Since the definition is objects that are non-solar system and non-stellar the list includes:
"Horsehead-Flame Nebulae by Roth Ritter".