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This picture of Io, Jupiter's innermost Galilean satellite, was taken... News Photo1979,Abstract,Approaching,Astronomy,Bizarre,Full Frame,Horizontal,Human Interest,Io,Moon,Morning,Mystery,No People,Outdoors,Science,Space Exploration,Space Mission,Voyager,Voyager 1Photographer Collection: Universal Images Group This picture of Io, Jupiter's innermost Galilean satellite, was taken by Voyager 1 on the morning of March 5, 1979, during the closest approach to this satellite. (Photo by: Universal History Archive/UIG via Getty Images)