The night sky is never truly dark. If you removed light pollution, the Moon, stars and galaxies, there would still be a very faint colorful glow. That’s airglow. pic.twitter.com/DLHXmLDAHY
— NASA Goddard Images (@NASAGoddardPix) October 24, 2018
via Twitter https://twitter.com/NASAGoddardPix
October 24, 2018 at 10:40AM
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