The US military's secretive X-37B robot spaceplane blasted off from on Thursday night on its seventh mission, the first launched atop a Falcon Heavy rocket capable of delivering it to a higher orbit than ever before.The Falcon Heavy, composed of three liquid-fueled rocket cores strapped together, roared off its launch pad from 's Kennedy Space Center at Cape Canaveral in a spectacular liftoff carried live on a SpaceX webcast.The launch followed more than two weeks of false starts and delays attributed to poor weather and unspecified technical issues, leading ground crews to roll the spacecraft back to its hangar before proceeding with Thursday's flight.
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