NASA ponders future without shuttles

U.S. space officials are concerned NASA will have to rely on other countries to carry astronauts into space after its three space shuttles are retired.

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<p><a href="http://www.physorg.com/news124352664.html">NASA ponders future without shuttles</a></p> <p>U.S. space officials are concerned NASA will have to rely on other countries to carry astronauts into space after its three space shuttles are retired. </p>