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What are Comet Tails Made Of?

Comet Hyakutake's tail, captured in this color image, is made of dust and gas. The Sun's heat drives these materials off the icy comet nucleus. The solar wind then pushes them away. Solar ultraviolet light makes the gas molecules glow, which is why we can see the tail. Astronomers used spectroscopes to identify the compounds in this glow during the comet's close passage.