Measuring Io’s subsurface temperatureJupiter’s moon Io is the most volcanically active body in the solar system. The Voyager, Galileo and Juno probes have all taken images of some of Io’s volcanoes actually erupting, too. But scientists hadn’t been able to determine the temperature of Io’s subsurface until this new study. Bottom line: NASA’s Juno spacecraft has measured Jupiter’s moon Io’s subsurface temperature for the first time, providing new clues about the tidally-heated volcanic world. Source: Io Sub-Surface Temperature Profile Observed by the Juno Microwave RadiometerVia NASARead more: Jupiter’s moon Io has a new volcano!