Why are Neptune and Uranus different colors?

NASA/ESA Hubble Space Telescope, Gemini North telescope and NASA Infrared Telescope Facility observations of Neptune and Uranus may have revealed why they differ in color. Credit: Directed by: Bethany Downer and Nico Bartmann Editing: Nico Bartmann Web and technical support: Enciso Systems Written by: Bethany Downer Music: Stan Dart - Organic Life Footage and photos: ESA/Hubble, ESA, NASA, STScI