For many years our place in the universe was the subject of theologians and philosophers, not scientists, but in 1960 one man changed all that. Dr Frank Drake was one of the leading lights in the new science of radio astronomy when he did something that was not only revolutionary, but could have cost him his career. Working at the National Radio Astronomy Observatory in Greenba...$肤浅。$Mono Lake里的微生物后来被证明仍然是依靠磷而不是砷来生长的,所以还是没找到那“另外一棵树”来证明生命曾经在地球上产生过不止一次。$不错