AJ-26 engines roar to life

AJ-26 engines roar to life
AJ-26 engines roar to life Two liquid-fueled AJ-26 engines power the Orbital Sciences Corporation Antares rocket into orbit during its maiden flight on April 21, 2013. The AJ-26 is a refurbished Soviet-era NK-33 engine originally built for Russia's N1 launch vehicle. NASA / Bill Ingalls

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