Although liquid water on Mars will quickly evaporate, photographs transmitted back to Earth by previous NASA missions to the planet reveal giant flood channels, dry river beds,and flood plains on the surface.

• 虽然火星上的液体水会很快蒸发，但国家航空和航天局以前勘测火星时发回到地面上的照片显示，火星表面上有一些洪水流过的巨大沟渠，干枯的河床及漫滩地带。