"No one expected Venus to be the poisonous hell that it is, or Mars to have the river valleys that it does," he said.

“没有人能够预料到，金星是那样一个充满毒气的地狱，而火星表面却有河谷。”他说。

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“No one expected Venus to be the poisonous hell that it is, or Mars to have the river valleys that it does,” he said.

“在我们进行宇宙探索之前，没有人能够预料到，金星是那样一个充满毒气的地狱，而火星表面却有河谷。” 他说。

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Many geological features like canyons, dried-up lakes and river channels point to the flow of liquid water in the distant past when Mars may have been warmer.

许多地质特征像峡谷，干涸的湖和河渠道，显示出了在遥远的过去，可能是火星的暖期有水流流动。

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This is the first view scientists have had of a fluvial system - one relating to a river or stream -- from the surface of Mars.

FORBES: Wall of Gale Crater