Employee, Volkmar Dohmen, stands in front of Xenon arc lamps that form a large artifical sun at the German Aerospace Center (DLR) in Juelich, Germany, 21 March 2017. A large artifical sun called Synlight can emit up to 10,000 times the intensity of the sun's light. (Photo by Caroline Seidel/Picture-alliance/DPA/AP Images)
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