https://briankoberlein.com/2015/01/25/easy-green/ Brian Koberlein Fri, 22 Feb 2019 18:22:15 +0000 hourly 1 https://wordpress.org/?v=5.1 https://briankoberlein.com/2015/01/25/easy-green/#comment-6184 Wed, 08 Aug 2018 13:41:46 +0000 https://briankoberlein.com/?p=4421#comment-6184 Hi Brian, comets appear green because of fluorescent emission of C2 molecules (they absorb and reemit sun light). The C2 molecule itself is formed in the coma, likely from more complex molecules. CN (not CN2) emits at 389 nm – Near UV, and does not contribute to the green light.

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