Wikipedia
Deep sky is a term used by amateur astronomers to describe mostly faint objects outside the solar system like star clusters, nebulae and galaxygalaxies; compare with "deep space". These objects are hundreds to billions of light years distant. The galaxies are beyond our home galaxy, the Milky Way, while the clusters and nebulae are part of our home galaxy. There is a galaxy visible to the naked eye called the Andromeda Galaxy, roughly 2.5 million light years away. A light year is equivalent to about 9 million million kilometers, which is the distance light travels in a year. In the video game ''Skies of Arcadia'', Deep Sky refers to the lower levels of the sky directly above what some call the Earth. Amateur astronomers would call this shallow sky.astro-stub Category:Astronomyfi:Syvä taivas
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