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Originally Posted by artdutra04
Spirit and Opportunity are just incredible pieces of engineering, lasting 855 and 834 days respectively on Mars, and still going. And to think that their designed lifespan was only 90 days.
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I seem to recall that the design team fessed-up on this. The project mission was only 90 days, but they knowingly overdesigned the system so it would last much longer.
Engineering philosophy learned from Scotty!