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An artist’s rendering depicts the atmosphere on Io, Jupiter’s volcanic moon, as it collapses during daily eclipses.

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An artist’s rendering depicts Io’s volcanic plumes creating the atmosphere in sunlight. Image Courtesy of Southwest Research Institute In full eclipse, Io’s atmosphere “collapses” as SO2 gas becomes frost on the moon’s surface. The atmosphere redevelops when sunlight returns.
Image Courtesy of Southwest Research Institute