1) Astronomers study it
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https://www.crosswordclues.com/clue/night-sky
[magazine] Night Sky is a discontinued American bimonthly magazine for entry-level stargazers. It was published between May/June 2004 and March/April 2007 by Sky Publishing, which also produces Sky & Telescope (S&T). Night Sky was intended to be a less technical than S&T. The target audience was recreational naked-eye and low-power instrume...
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http://en.wikipedia.org/wiki/Night_Sky_(magazine)
[play] Night Sky is a 1991 play by Susan Yankowitz, which originally premiered in New York starring Joan MacIntosh, under the direction of Joseph Chaikin, whose personal struggles with stroke and aphasia were the original inspiration for the play. It was later produced Off-Broadway in a revised version under the direction of Daniella Topol ...
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http://en.wikipedia.org/wiki/Night_Sky_(play)
The term night sky refers to the sky as seen at night. The term is usually associated with astronomy, with reference to views of celestial bodies such as stars, the Moon, and planets that become visible on a clear night after the Sun has set. Natural light sources in a night sky include moonlight, starlight, and airglow, depending on location and ...
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http://en.wikipedia.org/wiki/Night_sky
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