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Jupiter's moon, Io, as seen by NASA's Juno spacecraft. Io is yellow-brown and looks somewhat like a potato: some of its geographical features look like the eyes on a potato. Io is partly illuminated by sunshine reflecting off of Jupiter's surface. The darkness of space provides a black background.

Jupiter’s Volcanic Moon Io

During its close flyby of Jupiter’s moon Io on December 30, 2023, NASA’s Juno spacecraft captured some of the most detailed imagery ever of Io’s volcanic surface. This image is the NASA Science Image of the Month for October 2025.

Image Credit: NASA/Jet Propulsion Laboratory–Caltech/Southwest Research Institute (SwRI)/Malin Space Science Systems (MSSS); Image processing: Emma Wälimäki © CC BY

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