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21 December 2005

Wednesday 21 December 2005 21:00-21:30 (Radio 4 FM)

Quentin Cooper reflects on the latest technology in mirrors, and visits the Steward Mirror Lab in Arizona to see some of the problems faced in creating giant mirrors for the world's largest telescopes.

Plus, how the enormous parabolic mirrors in the French Pyrenees are helping scientists to harness and focus the intensity of the sun.

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