U.S. launched 1st satellite 50 years ago

This month marks the 50th anniversary of the launch of the United States' first satellite to orbit the Earth.

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<p><a href="http://www.physorg.com/news120230231.html">U.S. launched 1st satellite 50 years ago</a></p> <p>This month marks the 50th anniversary of the launch of the United States' first satellite to orbit the Earth. </p>