SpaceX successfully test fired the rocket engines of the Falcon Heavy.
The company initiated a burn that lasted only 12 seconds, but each of the rocket's 27 Merlin engines roared to life simultaneously, spewing out an immense plume of smoke.
But the Falcon Heavy did not takeoff from Cape Canaveral's historic LC-39A launch site.
Instead, SpaceX conducted a static fire test to ensure the engines work.
