panspermia

The confirmation of Mars-Earth panspermia would suggest that life, once started, could readily spread within a star system.

「火星–地球」种说如获证实，表示生命一旦出现，便能轻易在星系内扩散。

For this reason, the most commonly discussed panspermia scenario involves the transport of microbes or their precursors from Mars to Earth.

基理由，最受人讨种说就是：微生物或其前驱物，是从火星送到地球。