Sembra vi siano evidenze di acqua sulla superficie del pianeta.
NASA
https://www.nasa.gov/press-release/nasa-confirms-evidence-that-liquid-water-flows-on-today-s-mars
NASA GIF
http://www.nasa.gov/images/content/577360main_pia14472-full-new.gif
NATURE
http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo2546.html