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On the afternoon of March 5 Voyager 1 took this picture of Ganymede,... News Photo1979,Abstract,Astronomy,Bizarre,Day,Full Frame,Ganymede - Planetary Moon,Horizontal,Human Interest,Large,Moon,Mystery,No People,Outdoors,Science,Space Exploration,Space Mission,Square,Unmanned Spacecraft,Voyager - Spacecraft,Voyager 1Photographer Collection: Universal Images Group On the afternoon of March 5, 1979, Voyager 1 took this picture of Ganymede, Jupiter's largest satellite. (Photo by: Universal History Archive/UIG via Getty Images)