Juno Reveals Subsurface Heat Beneath Io, Solar System's Most Volcanic Moon
TL;DR
NASA's Juno spacecraft, using its Microwave Radiometer, detected heat rising beneath Io’s surface during two close flybys, revealing a subsurface temperature gradient of more than 40°F a few feet deep. The heat could come from a conductive crust or cooling lava flows and underscores Io's extreme tidal heating, offering insights into volcanism and potentially informing studies of subsurface oceans on other worlds.
- NASA Detects Intense Heat Beneath Io, Jupiter’s Most Volcanic Moon Gizmodo
- NASA’s Juno Takes Temperature of Jupiter’s Fiery Moon Io NASA (.gov)
- What lurks beneath the volcanoes of Jupiter's moon Io? NASA's Juno probe just took a peek Space
- NASA’s Juno Probe Has Seen Inside The Solar System’s Most Volcanic World, And It's Pretty Hellish In There IFLScience
- Juno Detects Io's Subsurface Hotter Than Models Predicted, Space Brief 27 Jul 2026 KeepTrack
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