The findings are “extremely exciting and unexpected, especially since Neptune’s previous period of low cloud activity was not nearly as dramatic and prolonged,” Chavez added. The findings also contradict the idea of the clouds being affected by Neptune’s four seasons, which each last about 40 years. Additionally, Neptune storms rising from the deep atmosphere do influence the planet’s cloud cover — but aren’t related to clouds formed in the upper atmosphere. That variable could interfere with studies looking at correlations between photochemically produced clouds and the solar cycle. More research could also suggest how long the near absence of clouds on Neptune might last.

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Persons: ”, Imke de Pater, Neptune brightened, Erandi Chavez, ” Chavez, Neptune, Patrick Irwin, wasn’t, Irwin, Carlos Alvarez, ” Irwin, “ Organizations: CNN —, University of California, NASA, Hubble, Keck, Lick, Center for Astrophysics, Harvard & Smithsonian, JPL, Caltech, University of Oxford, Keck Observatory Locations: Berkeley, Hawaii, California