Forty years ago today American astronaut Neil Armstrong landed on the moon, and 2009 has been named The International Year of Astronomy. So today we ask ourselves, has the celestial become mundane? Can the most remote mysteries ever be known? Although the stars may seem out of reach, two astronomers discuss the enduring importance of our yearning to understand them, not to mention just how much we've learned in recent years.—Original airdate: 4/20/2009



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