Hitch-hikers' ride

日期:2019-03-05 12:19:05 作者:幸宰 阅读:

By Anil Ananthaswamy FOR the first time, millions of bacterial spores have been purposely exposed to outer space, to see how they are affected by solar radiation. The results support the idea that life could have arrived on Earth in the form of bacteria carried from Mars on meteorites. The idea that life started elsewhere and spread through space is called panspermia. It was first proposed in 1903 by the Swedish chemist Svante Arrhenius, who suggested that solar radiation might propel single spores across solar systems. Then, in the 1970s,