SpaceX test-fires powerful Falcon Heavy rocket

SpaceX has test-fired its powerful Falcon Heavy rocket, a critical hurdle ahead of the new booster's maiden flight. The brief ignition caused a huge cloud of exhaust to emerge from historic pad 39A at the Kennedy Space Center in Florida. SpaceX founder Elon Musk announced after the test-fire that the rocket would be launched in "a week or so."

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(Source: CBS News,