SLS use of SSME----Expensive Reusable SSME on EXPENDABLE Vehicle

The space shuttle main engines are the most expensive rocket engines ever produced. They're so expensive because they're REUSABLE, which is awesome and way beyond what other engines can do. So now SLS has the brilliant brain wave to take SSMEs and put them on an expendable booster. Brilliant, I tell you.
8 hours ago

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