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Uranus' atmosphere is predominantly made up of hydrogen and helium. Unlike Jupiter and Saturn, these light gases dominate only the outer edges of the planet, but are not a significant contributor to the rocky interior. The dull blue color of Uranus is caused by the presence of methane, which absorbs red light.
  Uranus has a blue green atmosphere because it has a very deep methane(hydrogen)layer that gives its blue green atmosphere.  From:a 8 year old child  .25 people found this useful. Edit. The absorption of red light by methane crystals in the upper atmosphere of Uranus gives it its blue/green appearance.