A look at NASA’s new images of Io, Jupiter’s ‘tortured moon’

New research is revealing the secrets of Io, the mysterious volcanic moon of Jupiter. Four centuries after Galileo discovered Io in 1610, NASA sent a spacecraft called Juno on a five-year mission to Jupiter and its moons. Last week, NASA released animated artists’ conceptions of Io based on data Juno collected during two flybys. John Yang reports.
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