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The drone that was headed toward Iran, the RQ-170 Sentinel, looks like a miniature version of the famous stealth fighter, the F-117 Nighthawk: sleek and sand-colored and vaguely ominous, with a single domed eye in place of a cockpit. With a wingspan of 65 feet, it has the ability to fly undetected by radar. Rather than blurting out its location with a constant stream of radio signals – the electronic equivalent of a trail of jet exhaust – it communicates intermittently with its home base, making it virtually impossible to detect. Once it reached its destination, 140 miles into Iranian airspace, it could hover silently in a wide radius for hours, at an altitude of up to 50,000 feet, providing an uninterrupted flow of detailed reconnaissance photos – a feat that no human pilot would be capable of pulling off.