NASA may delay 2020 moon launch

NASA's plans to return astronauts to the moon are quietly being revised and are in danger of slipping past 2020.

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<p><a href="http://www.physorg.com/news159646447.html">NASA may delay 2020 moon launch</a></p> <p>NASA's plans to return astronauts to the moon are quietly being revised and are in danger of slipping past 2020.</p>