Everywhere he goes, crowds gather to meet Buzz Aldrin. He's a world-class hero, a larger-than-life figurehead, and the best known of a generation of astronauts whose achievements surged in just a few years from first man in space to first men on the moon. Now he pauses to reflect and share what he has learned, from the vantage point not only of outer space but also of time: still a nonstop traveler and impassioned advocate for space exploration.