Why are comet heads green — but not their tails?

Researchers recently proved a 90-year-old theory on why comets’ heads, but never the tails, are green, by spectroscopic investigation of an accidentally-discovered deviation in the dicarbon molecule.

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Gerhard Herzberg ,Robertw Field ,Timothyw Schmidt ,Lawrence Livermore National Laboratory ,University Of New South Wales ,Jun Jiang Phd ,Professor Timothy ,New South Wales ,Humpty Dumpty ,Comets ,Pectroscopy ,Bicarbon ,2 ,Jun Jiang ,Alence Hole Electron Configurations ,Pectroscopic Perturbations ,Redissociation ,Hotodissociation ,Omet Colors ,Reen Comets ,