当NASA 探索火星的计划被提上日程，人们对于“地外生命”的讨论就开始变得更加热烈起来。暂且不提那些虚无缥缈，坐着飞碟的小绿人，人们讨论的是更加简单的生命形 态，比如单细胞生物。 NASA 已经表示，人类在 20 年内肯定会找到地外生命存在的证据。科学家们何以那么有自信？先让我们来盘点一...
when NASA's exploration program Mars has been put on the agenda, people for a discussion of the extraterrestrial life "began become more warm up. Aside from the disembodied, sat a flying saucer of little green men, people discussed is more simple life forms, such as single cell organisms. NASA has said, the human will in 20 years to find evidence of the existence of extraterrestrial life. Why do scientists so confident? First let us take a stock...
