The SpaceX rockets

The SpaceX project's rocket launch was aborted in last half-second before liftoff because of an engine problem.

Workers, bottom, check out the engines on the Falcon 9 SpaceX rocket on space launch complex 40 at the Cape Canaveral Air Force Station in Cape Canaveral, Fla. Photo / AP

Image 1 of 6: Workers, bottom, check out the engines on the Falcon 9 SpaceX rocket on space launch complex 40 at the Cape Canaveral Air Force Station in Cape Canaveral, Fla. Photo / AP

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