Stratolaunch PGA engine
An illustration of Stratolaunch's PGA engine, a liquid-oxygen/liquid-hydrogen engine that the company plans to use on a series of launch vehicles it is developing.

Stratolaunch revealed new details Sept. 27 about a rocket engine it is developing for use on future launch vehicles that will fly from a giant aircraft approaching its first flight.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...