Look up from your BlackBerry one night. That is the moon. On it are exactly 12 sets of human footprints — untouched, unchanged, abandoned. For the first time in history, the moon is not just a mystery and a muse, but a nightly rebuke. A vigorous young president once summoned us to this new frontier, calling the voyage "the most hazardous and dangerous and greatest adventure on which man has ever embarked." And so we did it. We came. We saw. Then we retreated. How could we?

Column, July 17, 2009, "The Moon We Left Behind" at washingtonpost.com, July 17, 2009.