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Slender as a stick insect, a solar-powered experimental airplane with a huge wing span completed its first test flight of more than 24 hours on Thursday, powered overnight by energy collected from the sun during a day aloft over Switzerland.
The organizers said the flight was the longest and highest by a solar-powered craft, reaching an altitude of just over 28,000 feet above sea level, at an average speed of 23 knots, around 25 miles per hour.
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