简介： Arewealoneintheuniverse?Foroverhalfacentury,legendaryNASAengineerandbest-sellingsciencefictionauthor,GentryLee,hasexploredeveryaspectofthisquestionintherealmsofspacescience,roboticexplorationandthehumanimagination.Atage82,hehascometoarevelatoryconclusion.
