An experimental solar-powered aircraft that set an altitude mark of 96,000 feet plunges into the Pacific. [BBC Tech News] Current to power its 14 propeller motors and onboard electronics was generated by high-efficiency solar cells spread across the upper surface of the long wing. When it crashed, Helios was testing an experimental, renewable fuel-cell system that would have enabled the vehicle to store daylight power to keep it aloft during the night.
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