Virgin Galactic’s plans to supplement its suborbital human spaceflight business by launching small satellites from its WhiteKnightTwo carrier aircraft are advancing with hot-fire ground tests of the two kerosene-fueled rocket engines it has designed for the application. Developed and built by Virgin Galactic engineers, the 3,500-lb.-thrust NewtonOne and 47,500-lb.-thrust NewtonTwo are the first- and second-stage engines, respectively, for the company’s planned LauncherOne rocket. ...

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