Moffett Federal Airfield, Calif. — The first plane that can fly day and night powered only by the sun is set to begin a transcontinental journey that will reach Washington by mid-June.
Solar Impulse, scheduled to lift off from this World War II-era airfield on Friday, has room for only one person and an average cruising speed of about 43 miles per hour. But its Swiss developers say the technology suggests the possibilities of clean-energy flight.
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