@GM2DBW @ESA_Tech Article explains how sunlight is concentrated https://t.co/Fz6cZJ7YFQ
— ESA (@esa) May 3, 2017
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@GM2DBW @ESA_Tech Article explains how sunlight is concentrated https://t.co/Fz6cZJ7YFQ
— ESA (@esa) May 3, 2017