AI Summary

New James Webb Space Telescope observations reveal that Callisto, Jupiter’s least studied Galilean moon, exhibits more activity than previously thought. Using the telescope’s Near‑Infrared Spectrograph, an international team led by Caltech’s Maria Camarca captured spectra of three key regions: the moon’s trailing hemisphere, the large Asgard impact basin, and a view centered on Valhalla, the solar system’s biggest multi‑ring impact structure. The findings, presented in a paper now accepted by the Planetary Science Journal and posted on arXiv, suggest that Callisto’s ancient, crater‑filled surface is not as inert as once believed.

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