Deep sky objects are celestial objects including nebulae, star clusters, galaxies etc. Astronomically speaking, they are classified as Messier's Objects or NGC (New General Catalog) objects
These objects are best observed at Dark Sites. Due to light pollution in the city areas, the best place to view such objects are in the rural areas or open fields with no street lamps around.
A bit of history, a long time ago, an astronomer by the name of Charles Messier started to catalog a list of celestial objects to assist amateur astronomers to avoid confusing them with comets. the result is the catalog known as the Messiers's Objects
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