Space Exploration Technologies (SpaceX) says a new version of its Falcon 9 launch vehicle aborted a planned restart of its upper stage engine during an otherwise successful Sept. 29 debut of the upgraded rocket. With more than $1 billion in commercial-launch backlog, restarting the Merlin 1D vacuum engine that powers the Falcon 9’s upper stage is critical to delivering government and commercial satellite payloads to geostationary transfer orbit (GTO), the destination of most commercial ...
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