Final SLS Engines Are Still An Unknown

Credit: NASA
NASA's go-as-you-can-pay approach to exploration-system development means the heavy-lift Space Launch System‭ (‬SLS‭) ‬in development to‭ ‬carry Orion beyond low Earth orbit and eventually on to Mars is very much a work in progress‭, ‬starting with the engines‭.‬ The U.S‭. ‬space agency hopes new...

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