Jupiter’s Moon Io from 500,000 miles Voyager 1, March 1979

Jupiter’s Moon Io from 500,000 miles Voyager 1, March 1979


Vintage chromogenic print, 20.3 x 25.4 cm

[NASA 79-HC-82 / 79-H-111], caption on verso

[Caption] This view of Io was taken on March 4 at 7.00 pm from a range of 363,200 kilometres (500,000 miles) by Voyager 1. It shows sub-spacecraft longitude of approximately 146 degrees. Circular features are seen that maybe meteorite impact craters or features of internal origin. Irregular depressions are seen that indicate surface modification has taken place. The bright irregular patches appear to be younger deposits masking the surface detail.

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.

Condition: mint

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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