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Space launch aborted at last second

A new private supply ship for the International Space Station remained stuck on the ground 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. But with a mere half-second remaining before lift-off, 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 lift-off," announced commentator George Diller, his voice trailing as the rocket failed to budge. "We've had a cut-off. Lift-off did not occur."

SpaceX president Gwynne Shotwell said that high combustion chamber pressure in engine number five was to blame.

During an inspection later in the day, engineers discovered a faulty valve and worked into the evening to replace it.

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 US companies hoping to take over the job of delivering cargo and eventually astronauts to the space station for Nasa.

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