Arewehumansaloneinspace？Scientistshavebeenworkingonthis...
問題詳情：Arewehumansaloneinspace？Scientistshavebeenworkingonthisquestionforalongtime．Andrecently，newdiscoveriesoffermorehopethatsomeformoflifeexistedonMarsinthepast，andperhapsisstillthereatpresent．According...