Data from Mars rover gives strong evidence that area was consistently wet in
the past.

    http://www.spaceref.com/news/viewpr.html?pid=13758

(Remembering, as always, that "strong evidence" and fact are often
correlated but not equal.)

Note that the Moon's south polar ice, which at one stage was so evident that
people would have bet their house on the evidence, is now more rationally
discussed.

Mars has also provided "strong evidence" for subterranean ice deposits,
mainly in its south polar regions, but these have not as yet been proven.
There are also many photos available which appear to show erosion channels
from very large water flows in the immediate past down the sides of valleys
where (apparently) sub-surface water has flown out of the water table when
it reached a rift. Surface water on Mars would currently boil away almost
instantly so such flows would be most spectacular to see.

Assignment: Pore  over countless available Mars photos for evidence of such
a flow in progress. Report back when you find one.

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