No visible engines, but they reach 30,000 feet at hypersonic speed: US Navy pilots report unidentified flying objects

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Pilots of the US Navy have reported seeing strange objects in the sky, a report in The New York Times said. The unidentified flying objects have no visible engines or infrared exhaust plumes, but that they could reach 30,000 feet at hypersonic speeds, the pilots have told their superiors in the United States. 



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