Aerojet Rocketdyne Cranking Up Expendable SSME

Credit: NASA
A critical leftover from the space shuttle program is scheduled to continue flying well into the 2020s, but with a key difference. NASA has 16 space shuttle main engines (SSMEs), plus two ground-test articles, and it plans to use them all—four at a time—to power the first stage of its heavy-lift...

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