New JWST observations led by Maria Camarca (Caltech), accepted in The Planetary Science Journal, reveal that Callisto — Jupiter's quietest Galilean moon — hides a surprisingly active surface chemistry. Using NIRSpec to map its trailing hemisphere, the Asgard basin, and Valhalla (the solar system's largest multi-ring impact structure), the team charted water ice, frozen CO2 anti-correlated with that ice, a faint patchy CO2 atmosphere, and a carbon-nitrogen signature stronger than on any other Galilean moon — with the JUICE mission set to look closer in the 2030s.
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, accepted in The Planetary Science Journal, reveal that Jupiter's quietest Galilean moon, Callisto, hides an intricate surface chemistry. Using the NIRSpec instrument to map its trailing hemisphere, the Asgard basin, and Valhalla — the solar system's largest multi-ring impact structure — the team charted water ice, frozen CO2 anti-correlated with the ice, a patchy CO2 atmosphere, and a carbon-nitrogen signature stronger than on any other Galilean moon.){kind=link}