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All photo galleriesFreddie Wilkinson / National Geographic
Tom Matthews (left) and Baker Perry at the weather station at Everest Base Camp: The members of the Perpetual Planet Extreme Expedition Everest have set up several weather stations this summer on the highest mountain in the world. For a few hours of the day, the instruments register more solar radiation than, according to the calculation models, actually arrives at the top of the earth's atmosphere.
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