Jupiter's Moon Io with plumes and a sunlit crescent at left. Io is the most volcanically active world in the solar system, with hundreds of volcanoes. Voyager 1 flew past Io on 5 March 1979 from a distance of 20,600 kilometres. The images returned during the approach revealed a strange landscape devoid of impact craters with three volcanic eruption plumes (upper left and lower right).

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Photo credit: © DETLEV VAN RAVENSWAAY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: 1, activity, astronomical, astronomy, black, crescent, exploration, galilean, historical, history, illuminated, illuminating, io, jovian, jupiter, lit, monochrome, moon, moons, planetary, plume, plumes, solar, space, sun, sunlit, surface, system, volcanic, volcano, voyager, voyager image, white