In pictures: 11 eye-catching solar tech projects

From the world's largest solar furnace to a still that turns salt water into drinking water, the range of devices that harness the sun's energy is breathtaking. Here are some of our favourites

Solar-powered, but not slow The Tokai Challenger solar racecar made its debut in 2009's World Solar Challenge, a biannual solar race across Australia. Designed and built by a team from Japan's Tokai University, the Tokai Challenger won the race that year and again in 2011.

The World Solar Challenge stretches 1,877 miles across the Australian Outback. The Tokai Challenger covered that distance in 29 hours and 49 minutes in 2009, then in a slightly slower 32 hours and 45 minutes in 2011. The car, covered in 2,176 solar cells that were originally designed by Sharp to be used in satellites, reached a top speed of 93 mph and averaged 60 mph.

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