Rescue shuttle at launch pad for Hubble trip (Update)

(AP) -- In an unprecedented step, a space shuttle was moved to the launch pad Friday for a trip NASA hopes it will never make - a rescue mission.

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<p><a href="http://www.physorg.com/news141037256.html">Rescue shuttle at launch pad for Hubble trip (Update)</a></p> <p>(AP) -- In an unprecedented step, a space shuttle was moved to the launch pad Friday for a trip NASA hopes it will never make - a rescue mission.</p>