Comets' heads may be green, but never their tails, study finds

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Comets' heads may be green, but never their tails, study finds
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Using a vacuum chamber and lasers, a new study explains how the sun breaks apart the organic matter on a comet, causing it to glow green. However, this process occurs so quickly, it's only the comets' heads that appear green, never their tails.

breaks apart a compound called diatomic carbon . The reaction causes the icy bodies to appear green. This process, called photodissociation, was originally theorized by physicist Gerhard Herzberg in the 1930s, but has been hard to test until now.

"We've proven the mechanism by which dicarbon is broken up by sunlight," Timothy Schmidt, senior author of the study and a chemistry professor at UNSW Science, said in the statement.

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