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Mission Clock

Snapshot: Mission Clock

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National Geographic
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by National Geographic on Oct 09, 2012
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The mission clock starts rolling at liftoff and is the basis for time aboard an orbiting space shuttle. After landing, it’s reset as part of preparations for the next mission, starting over again at launch. Because Endeavour will never have another mission to space, every time the power was turned on the clock continues from STS -134. The longest shuttle mission was 17 days, 15 hours, 53 minutes, and 18 seconds, far shorter than the 60+ days recorded here.


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