Mars today is a world of cold and lonely deserts, apparently without life of any kind, at least on the surface. Worse still, it looks like Mars has been cold and dry for billions of years, with an atmosphere so thin, any liquid water on the surface quickly boils away while the sun's ultraviolet radiation scorches the ground. But there is evidence of a warmer and wetter past -features resembling dry riverbeds and minerals that form in the presence of water indicate water once flowed through Mars. (source: nasa.gov)
|
