DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Solar parabolic mirror. Close-up of a solar energy generating systems (SEGS) parabolic (curved) mirror in California's Mojave desert, USA. The parabolic mirrors track the Sun across the sky and focus the Sun's rays onto vacuum tubes (white, centre right), which contain a synthetic oil. The oil becomes super-heated and is used to boil water for steam turbine generators.
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