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People look on as Solar Impulse's solar-powered HB-SIA prototype airplane stands on the runway after its first successful night flight attempt at Payerne airport, Thursday, July 8, 2010. The aircraft took off July 7 at 06:51 a.m. and reached an altitude of  28,543 feet by the end of the day. It then slowly descent to 4,921 feet and flew during the night on the batteries, charged during the day by 12,000 solar cells, which powered the four electric motors. It landed July 8 at 09.00 a.m. for a flight time of 26 hours and 9 minutes, setting the longest and highest flight ever made by a  solar plane. (AP Photo/Keystone, Denis Balibouse, Pool)
Photo by: Denis Balibouse
People look on as Solar Impulse's solar-powered HB-SIA prototype airplane stands on the runway after its first successful night flight attempt at Payerne airport, Thursday, July 8, 2010. The aircraft took off July 7 at 06:51 a.m. and reached an altitude of 28,543 feet by the end of the day. It then slowly descent to 4,921 feet and flew during the night on the batteries, charged during the day by 12,000 solar cells, which powered the four electric motors. It landed July 8 at 09.00 a.m. for a flight time of 26 hours and 9 minutes, setting the longest and highest flight ever made by a solar plane. (AP Photo/Keystone, Denis Balibouse, Pool)

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