Jupiter and its satellite Io, Voyager 2, June 1979

Jupiter and its satellite Io, Voyager 2, June 1979

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Vintage chromogenic print, 20.2 x 25.4 cm
NASA/JPL 79-H-363, caption on verso
NASA launched the two Voyager spacecraft to Jupiter, Saturn, Uranus, and Neptune in the late summer of 1977. Voyager 1's closest approach to Jupiter occurred March 5, 1979. Voyager 2's closest approach was July 9, 1979. Discovery of active volcanism on the satellite Io was probably the greatest surprise. It was the first time active volcanoes had been seen on another body in the solar system. It appears that activity on Io affects the entire Jovian system. Io appears to be the primary source of matter that pervades the Jovian magnetosphere, the region of space that surrounds the planet, primarily influenced by the planet's strong magnetic field. Sulphur, oxygen, and sodium, apparently erupted by Io's volcanoes and sputtered off the surface by impact of high-energy particles, were detected at the outer edge of the magnetosphere.
About the Voyager missions here and watch the probe's distance from Earth increase (and occasionally decrease!) in real time here

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