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After nearly seven years of varying concepts, redesigns, and delays, SpaceX is poised to launch the Falcon Heavy rocket next week on its maiden flight. Last week, SpaceX performed a hold-down firing of the massive rocket’s 27 engines, creating a towering exhaust plume and jolting the space coast with over 5 million pounds of thrust. It was the most powerful engine test ever conducted at Kennedy Space Center—and with a successful liftoff, the Falcon Heavy would be the most powerful launch vehicle in the world.