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An experimental solarpowered plane landed safely Thursday after completing its first 24hour test flight, proving that the aircraft can collect enough energy from the sun during the day to stay aloft(在空中) all night.
Pilot Andre Borschberg eased the Solar Impulse onto the runway at Payerne airfield about 30 miles southwest of the Swiss capital Bern at exactly 9 a．m. (3 a．m. EDT) Thursday. Helpers rushed to stabilize the pioneering plane as it touched down, ensuring that its massive 207foot wingspan didn’t scrape the ground and topple(倾倒) the craft.
The record feat(壮举) completes seven years of planning and brings the Swissled project one ste
