Floods, fires and fluorescent fish — September’s best science images
in Chile’s Atacama Desert, one of the driest and sunniest places on Earth. The plant, which opened earlier this year, comprises a 250-metre-high tower surrounded by more than 10,000 mirrors — called heliostats — spread over 7.5 square kilometres. The heliostats reflect the Sun’s radiation onto a receiver at the top of the tower, where the heat is transferred to a system that drives an electricity-producing steam turbine.
“The oldest ‘ring’ lies in the centre while the most recent sits furthest away,” says Woolley. Month by month, the rings grow like the rings of a tree. “The overall image is a marking of the passing of time, which incorporates visual evidence of increasing levels of solar activity apparent in the dark markings of solar flares,” she adds. The colours of the image have been adjusted to enhance its tree-like appearance.
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