
Royal Astronomical Society: On 5 July 2012, a plume of Antarctic air descended over the European Southern Observatory's Paranal site in Chile. The home of the Very Large Telescope, Paranal is 2635 m above sea level and is almost always one of the best sites in the world for optical and near-infrared astronomy. But for the 12 hours when the cold front visited the site, the atmosphere became extraordinarily dry, making the skies even clearer than usual. The team of scientists who report on this un...
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