Friday, July 24, 2026

Juno Measures the Heat Below Io's Restless Surface

The JunoCam instrument captured this image of the volcanic moon Io during Juno's flyby in December 2023. During this and the next flyby in February 2024, Juno used its Microwave Radiometer instrument to meausure the heat several meters under the moon's surface. Image Credit: NASA/JPL-Caltech/SwRI/MSSS. Image processing by Gerald Eichstädt

Juno's Microwave Radiometer (MWR) was built peer deep down into Jupiter's massive atmosphere. But during the spacecraft's extended mission, it's been studying the Galilean moons. During two flybys of volcanic Io, the spacecraft its MWR to measure the heat flowing from deep within the moon.



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