"I was in awe," said Scott Bolton, principal investigator of the Juno mission, commenting on the colorful and volcanic landscape of Io.
It's not the first time a NASA spacecraft has flown by Io. In 1979, Voyager 1 discovered Io was volcanically active during its journey to interstellar space. Two decades later, NASA's Galileo mission sent back what Dr. Bolton calls 'postage stamps', or close-ups of specific features on Io's surface.
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