Comets' heads can be green, but never their tails. After 90 years, we finally know why: The team solved this mystery with the help of a vacuum chamber, a lot of lasers, and one powerful cosmic reactio
A study has solved a 90-year-old mystery by proving the mechanism by which dicarbon -- the chemical that makes some comets' heads green -- is broken up by sunlight. This explains why the vibrant green color never reaches the comet's tail.
Every so often, the Kuiper Belt and Oort Cloud throw galactic snowballs made up of ice, dust and rocks our way: 4.6-billion-year-old leftovers from the formation of the solar system.These snowballs -… [+6495 chars]
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