It smashed the record for an unmanned flight by a solar airplane by flying into the air for an impressive 83 hours and 37 minutes, more than double the official record by "Global Hawk" in 2001. The plane was guided by autopilot and satellites to a height of 60,000 feet, and powers off the sun during the day, prepping its rechargeable lithium-sulphur batteries for the night. Zephyr is being built for reconnaissance and communications.
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