If you look closely enough, you’ll see the night sky is actually a little green. SciShow Space explains the science behind the phenomenon known as airglow.
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Sources:
http://www.nrcresearchpress.com/doi/pdf/10.1139/v69-313
http://blogs.discovermagazine.com/badastronomy/2012/06/11/the-softly-glowing-night-sky
http://www.universetoday.com/112237/how-to-see-airglow-the-green-sheen-of-night/
http://www.albany.edu/faculty/rgk/atm101/airglow.htm
http://www.albany.edu/faculty/rgk/atm101/structur.htm
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