[Southack]

"Lulin’s green color comes from the gases that make up its Jupiter-sized atmosphere. Jets spewing from the comet’s nucleus contain cyanogen (CN: a poisonous gas found in many comets) and diatomic carbon (C2)."

Remember when they used to tell us that comets were made of ice...

[Toddsterpatriot]

Remember when they used to tell us that comets were made of ice...

Some of the ice is frozen gas, like CN, CH4, H2, CO2.