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Subglacial water on Mars
ngunn
post Aug 3 2020, 07:01 PM
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This topic has been discussed here over a spread of time and in various threads but not recently, I think. This article might be a good way to kick off some more discussion from a present day perspective if anyone's interested:
https://www.sciencedaily.com/releases/2020/...00803120154.htm
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ngunn
post Aug 8 2020, 08:52 AM
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Thanks to all for the insightful comments. I agree that the history and geography of Mars are both extensive enough to accommodate many different climatic conditions and a wide variety of valley-forming processes. The Science Daily article says as much despite its icy headline. I would make just two general observations that this work would seem to support:
1/ Subglacial water flow could have persisted through a wider range of planetary conditions than surface rivers. This would include cold periods with low atmospheric pressure.
2/ There is likely to have been much more ice on Mars in the past than there is now since it is inexorably depleted by evaporation/sublimation and atmospheric leakage. It is therefore reasonable to imagine that it was a major feature of the landscape in ancient times.
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