After decades of global dominance, America's space shuttle program ended last summer while countries like Russia, China and India continue to advance their programs.
But astrophysicist Neil deGrasse Tyson, author of the new book Space Chronicles: Facing the Ultimate Frontier, says America's space program is at a critical moment. He thinks it's time for America to invest heavily in space exploration and research.
http://pd.npr.org/anon.npr-mp3/npr/me/2012/02/20120227_me_13.mp3
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