SpaceX still has some road ahead before Falcon Heavy’s debut flight, but the day is approaching. On Dec. 28, the triple-core, 229-ft. -tall (70-m) booster was hoisted vertically for fit checks at Kennedy Space Center’s Launch Complex 39A. Two weeks later, fuel flowed into the tanks in preparation for lighting the rocket’s 27 first-stage engines together for the first time, a test that likely will be repeated at least once before the Falcon Heavy attempts a liftoff. The ...

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