Instead of the once - white surface that reflected solar rays back into space, the darker surfaces now absorb more energy from the sun. (livescience.com)
It is also one of the oldest, in terms of technical applications to concentrate solar rays to generate steam and electricity. (instituteforenergyresearch.org)
A prototype rooftop collector focuses solar rays into a set of half - inch - wide polymer fibers that are capped in heat - resistant quartz. (discovermagazine.com)