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Uranus’ moons might have spontaneous atmospheres and migrating ice.

According to New Scientist, a planetary researcher at Southwest Research Institute in Texas named Ben Teolis talked about the seasonal quirks of Uranus’ moons in a presentation at the annual American Geophysical Union meeting last week.

Based on carbon dioxide experiments and computer models, Teolis reportedly found that as the moons’ poles exit a 42-Earth-year night, solar radiation could rapidly convert surface ice to gas, forming a tenuous exosphere that snows down on the opposite pole to sit for another 42 years.