The countdown reached all the way to practically zero Saturday morning for the SpaceX Falcon 9 rocket. The engine ignition sequence started up, but there was an automatic shutdown by on-board ... more 
The countdown reached all the way to practically zero Saturday morning for the SpaceX Falcon 9 rocket. The engine ignition sequence started up, but there was an automatic shutdown by on-board computers. So instead of blasting off on a delivery mission to the space station, the rocket stayed on its launch pad amid a cloud of engine exhaust. less 
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Scripps
Tue, May 22, 2012 2:42 AM EDT