A solar-powered airplane that developers hope to eventually pilot around the world took off early on Friday from San Francisco Bay, on the first leg of an attempt to fly across the United States with no fuel but the sun's energy. The plane, dubbed the Solar Impulse, departed shortly after 6 a.m. local time from Moffett Field, a joint civil-military airport near the south end of San Francisco, heading first to Phoenix on a slow-speed flight expected to take 15 to 20 hours.moreless
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