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More Wet Gullies
marsbug
post Dec 13 2013, 11:57 AM
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QUOTE (Phil Stooke @ Dec 13 2013, 12:59 AM) *
I can't yet see these features as anything but dry granular flows. I'm willing to be shown I am wrong...

Phil

I'm more or less of the same mind: I don't see any specific reason why they shouldn't be caused by some kind of brine...but I see no reason why they should be, brine just being one of a great many alternative explanations. I think this story is really riding in the wake of the discovery of ancient habitable conditions at Curiositie's site.


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algorimancer
post Dec 13 2013, 04:14 PM
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QUOTE (marsbug @ Dec 13 2013, 05:57 AM) *
... I don't see any specific reason why they shouldn't be caused by some kind of brine...but I see no reason why they should be, brine just being one of a great many alternative explanations. ...

Agreed. This may be troublesome to sort-out. Even given remote measurements of associated water vapor, I could envision a dust-fall yielding a water vapor release due to the exposure of subsurface ice/brine, rather than being directly associated with a liquid seep. It seems we would need to image actual flowing water to resolve this, and I think even MRO lacks that level of resolution.
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marsbug
post Dec 15 2013, 04:18 PM
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I stumbled across this on the bbc science and technilogy site: Water carved gullies on Vesta? I'm just bringing it up to make the point: Features that are very suggestive of a water like fluid occur even on worlds where the idea of ANY liquid surface water strains the imagination.


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TheAnt
post Dec 22 2013, 07:51 AM
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QUOTE (marsbug @ Dec 15 2013, 05:18 PM) *
Features that are very suggestive of a water like fluid occur even on worlds where the idea of ANY liquid surface water strains the imagination.


Funny that you mentioned that one, since I have used those features on Vesta as one example that the gullies on Mars must have been done by the same kind of flow. Saying that it in both cases must be extremely dry dust that without any trace of humidity (causing stickiness) creating flows that resemble one made by a liquid.
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