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SpaceX engineers are expected to conduct a fit check and complete other tests at pad 39A this week, followed by a hold-down firing of all 27 first stage engines some time after New Year’s Day. The company has not set a target date for the Falcon Heavy’s first liftoff, but officials say the launch is targeted in January, some time after the hold-down hotfire test.
Should it launch successfully, the Falcon Heavy will be the most powerful rocket in the world.
Update: They have now lowered the Falcon Heavy to a horizontal position. I suspect that the raising and lowering were both part of the fit check tests, and that they will soon raise the rocket up again.