NASA considers second emergency spacewalk

The successful emergency spacewalk by a shuttle Discovery astronaut Wednesday might soon be followed by the world's second such emergency repair mission.

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<p><a href="http://www.physorg.com/news5599.html">NASA considers second emergency spacewalk</a></p> <p>The successful emergency spacewalk by a shuttle Discovery astronaut Wednesday might soon be followed by the world's second such emergency repair mission. </p>