Jupiter’s moon Ganymede is the only satellite in the Solar System known to have an intrinsic magnetic field. Interactions between this field and the magnetosphere of Jupiter are expected to funnel most of the associated impinging charged particles, which alter surface chemistry across the Jupiter system, to Ganymede’s polar regions. Using observations obtained with the NASA/ESA/CSA James Webb Space Telescope, astronomers have now detected hydrogen peroxide, a radiolysis product of water ice, specifically constrained to the high latitudes of Ganymede.
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