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Deep sky is a term used by amateur astronomers to describe mostly faint objects outside the solar system like star clusters, nebulae and galaxies; compare with "deep space". These objects are hundreds to billions of light years distant. The galaxies, other than the Milky Way, are beyond our home galaxy, whereas nearly all clusters and nebulae are contained within galaxies. There are a number of galaxies visible to the naked eye. They are in order of closeness the Milky Way, Large Magellanic Cloud (≈160,000 light years), Small Magellanic Cloud (≈200,000 light years) and Andromeda Galaxy, (≈2.5 million light years). 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.
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