Looks like Kim Stanley Robinson was right.

A radar instrument aboard a NASA spacecraft has detected large glaciers hidden under rocky debris that may be the vestiges of ice sheets that blanketed parts of Mars in a past ice age, scientists said on Thursday.

The glaciers, the biggest known deposits of water on Mars outside of its poles, could prove useful for future manned missions to the red planet as drinking water or rocket fuel, University of Texas planetary geologist John Holt said.

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