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This picture of Io, the innermost Galilean satellite, was taken by... News Photo1979,Astronomy,Human Interest,Io,Majestic,Morning,No People,Outdoors,Planet - Space,Science,Solar System,Space Exploration,Space Mission,Sphere,Vertical,Voyager,Voyager 1Photographer Collection: Universal Images Group This picture of Io, the innermost Galilean satellite, was taken by Voyager 1 on the morning of March 5, 1979. (Photo by: Universal History Archive/UIG via Getty Images)