The proposed merger between Orbital Sciences Corp. and the aerospace and defense divisions of ATK could yield a more powerful – and politically palatable – Antares launch vehicle, according to company officials. Orbital Chairman and CEO David Thompson says his company is considering an ATK proposal to develop a solid-rocket propulsion system to replace the modified Russian NK-33 engines that power the Antares rocket’s Ukrainian-built first stage. In an April 29 interview ...


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