The Kuiper Belt is a massive disk of icy bodies, including Pluto, that is located just outside of Neptune’s orbit in our solar system. Objects observed in the Kuiper Belt exhibit a more diversified color range than any other solar system population, with colors ranging from white to dark reddish. While the source of this diversity in colors is unknown, scientists have speculated that it is likely the result of the prolonged exposure to radiation of organic materials by galactic cosmic rays.
Click here for original story, Researchers solve colorful Kuiper Belt puzzle
Source: Phys.org