Space station mission has changed

It's been 22 years since U.S. President Ronald Reagan proposed building the International Space Station, but its mission has since radically changed.

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<p><a href="http://www.physorg.com/news71817961.html">Space station mission has changed</a></p> <p>It's been 22 years since U.S. President Ronald Reagan proposed building the International Space Station, but its mission has since radically changed. </p>