NASA faces long odds in shuttle schedule

The United States' three-ship space shuttle fleet faces "significant challenges" in its future orbiter work, the U.S. government has warned.

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<p><a href="http://www.physorg.com/news128515125.html">NASA faces long odds in shuttle schedule</a></p> <p>The United States' three-ship space shuttle fleet faces "significant challenges" in its future orbiter work, the U.S. government has warned. </p>