"Our picture of its subsurface must now be expanded to include the possibility of misty ice caverns floored with pools and channels of salty water, " Spencer wrote.

“我们关于它表面的照片现在必须被扩展到包括以咸水沟和池为基底的雾冰洞穴之类可能的东西，”斯宾塞写到。

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The resulting data must then be processed to produce a picture of the subsurface.

ECONOMIST: Inside story

The ingredients for life the researchers describe, "including energy sources, would have been more available early in Mars' history, but it doesn't take too much imagination to picture a scenario in which the subsurface is habitable today, " Michalski said.

MSN: Giant Mars crater shows evidence of ancient lake