Deep-sky-object definition

dēpskī
Any of various celestial objects, including nebulae, star clusters, and galaxies, that are diffuse and very distant, and therefore faint, usually observable only by means of a telescope.
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An object in the night sky other than a solar system object, single star or multiple star system.
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Other Word Forms

Noun

Singular:
deep-sky-object
Plural:
deep-sky-objects