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Originally Posted by Roger
Not to be overly critical (Monday morning quarterback/backseat driver/etc), but given that they designed this thing to last only 90 days, and it lasted 3 years, why didn't they design it to last a longer time?
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Because it was never designed to last
only 90 days. It was designed to respond to the Mission Success Criteria requirement that it absolutely must last
at least 90 sols (a sol is a Martian day, which is 24 hours 40 minutes).
-dave