A solar-powered plane nearing the end of a cross-continental journey landed early Sunday at Dulles International Airport outside Washington.
The aircraft, the Solar Impulse, began its journey May 3 in San Francisco and has made stops in Arizona, Texas, Missouri and Ohio, staying several days in cities along the way.
The Solar Impulse is powered by about 12,000 photovoltaic cells that cover its enormous 63-meter wings and charge its batteries during the day so it can fly at night. The …
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