Twin Voyager Spacecraft Turn 30

Voyager Spacecraft Turns 30
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In 1979 Voyager 1 snapped this iconic image of Jupiter and two of its more than 50 known moons, Io (left) and Europa (right).

Scientists studying images returned from the Voyager mission were surprised to see plumes from active volcanoes on Io, one of the four moons of Jupiter that were first spotted by Italian astronomer Galileo Galilei in 1610.

Today NASA scientists consider Io to be the most volcanically active body in the solar system.

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—Image courtesy NASA/JPL-Caltech
 
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