Science writer John Wilford once observed that his articles had to focus on one of these story lines to earn their way into print: "big bang, big bucks, big screwup, or big comeback - and with the Hubble Space Telescope you've got them all." He was right. Since launching into orbit almost 30 years ago, Hubble has gone from the humiliation of "techno turkey" to high-risk recovery to recognition as one of history's most prolific scientific explorers.