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—or as we know them, comets—go through a colorful metamorphosis as they cross the sky, with many comets’ heads turning a radiant green color that gets brighter as they approach the Sun.
But strangely, this green shade disappears before it reaches the one or two tails trailing behind the comet.
Astronomers, scientists and chemists have been puzzled by this mystery for almost a century...
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