They're designed to burn, so they're solid propellant. You can't turn them off. They're designed to burn out exactly the same time. They're poured to very high tolerances in Ogden, Utah, at a company called Thiocolle. And they're supposed to flame out 2 minutes and 5 seconds into the liftoff. Flame out at the same time? Well, in our case, one. (21:55–22:03)
CLAIM
Asserts that solid rocket boosters are manufactured in Ogden, Utah, by Thiocolle.
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