Orbital Sciences Corp. will build a new liquid-fueled medium-lift launch vehicle as part of its winning proposal in NASA’s Commercial Orbital Transportation Services (COTS) recompetition, adding at least $150 million of its own money to $170 million in federal seed money NASA brings to the effort. The new vehicle—Taurus II—will use the Russian-built AJ-26 engines marketed by Aerojet to lift about six metric tons to low Earth orbit. Its liquid oxygen/kerosene first stage—to be built with ...


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