NASA: Keeping shuttle costs $3 billion yearly

(AP) -- NASA's chief says it would cost an extra $3 billion a year to keep flying the space shuttle past next year's retirement date. Plus it would extend the risk of a deadly accident.

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<p><a href="http://www.physorg.com/news150640166.html">NASA: Keeping shuttle costs $3 billion yearly</a></p> <p>(AP) -- NASA's chief says it would cost an extra $3 billion a year to keep flying the space shuttle past next year's retirement date. Plus it would extend the risk of a deadly accident.</p>