Nasa / Jupiter / Lo (Moon) Poster
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Just a few years after Pioneer 11 flew its initial reconnaissance mission, NASA launched the twin Voyager spacecraft to explore the outer solar system. When Voyager 2 arrived “at†Jupiter (well, it was about 8 million miles away), here's one of the photos it took. It shows the planet and Io, its smallest and closest Galilean moon (named so since Galileo discovered four of them). Io is covered in volcanoes and is the same size as our own rocky satellite.PHOTOGRAPH: JPL