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Storm clouds gather on Saturn

7 January 1995

IF you’re travelling to Saturn, take an ammonia-proof umbrella: the bright patch of cloud near Saturn’s rings is a massive convective storm – similar to a terrestrial thunderstorm – as large as the Earth. The white Saturnian storm cloud contains ammonia crystals. Researchers say such storms appear to erupt only during the Saturn summer in the northern hemisphere. So far, they cannot explain why.

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