SpaceX rocket launch aborted in last second

CAPE CANAVERAL, Fla. (AP) -- A new private supply ship for the International Space Station remained stuck on the ground Saturday after rocket engine trouble led to a last-second abort of the historic flight.

All nine engines for the SpaceX Falcon 9 rocket roared to life Saturday morning. But with a mere half-second remaining before liftoff, the onboard computers automatically shut everything down. So instead of blasting off on a delivery mission to the space station, the rocket stayed on its launch pad amid a plume of engine exhaust.

Even NASA's most seasoned launch commentator was taken off-guard.

"Three, two, one, zero and liftoff," announced commentator George Diller, his voice trailing as the rocket failed to budge. "We've had a cutoff. Liftoff did not occur."

SpaceX president Gwynne Shotwell said that high combustion chamber pressure in engine No. 5 was to blame and that technicians would conduct an inspection later in the day. If the engine needs to be replaced, a spare is available.

Tuesday is the earliest that SpaceX can try again to send its cargo-laden Dragon capsule to the space station. The California-based company - formally known as Space Exploration Technologies Corp. - is targeting every few days for a launch attempt to save fuel in case of rendezvous problems at the space station. Wednesday also could be a launch option.

This was the first launch attempt by the several private U.S. companies hoping to take over the job of delivering cargo and eventually astronauts to the space station for NASA. Only governments have accomplished that to date: the United States, Russia, Europe and Japan.

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