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TheAnt
Cartography work carried out by USGS have revealed further proof of ancient lake beds and signs of Mars-quakes in the Valles marineris region.

A shorter pressrelease from JPL.
TheAnt
Warming by asteroid impacts might yield a too transient warming to explain the erosion seen on Mars, now Penn state university suggest that dramatic climate cycles created somewhat warmer longer periods that could explain how running water carved Mars' surface.
TheAnt
CNRS, Laboratoire de Planétologie et Géodynamique de Nantes, France: Moraines left by carbon dioxide glaciers on Mars.
atomoid
QUOTE (TheAnt @ Dec 2 2016, 12:14 AM) *
Warming by asteroid impacts might yield a too transient warming to explain the erosion seen on Mars, now Penn state university suggest that dramatic climate cycles created somewhat warmer longer periods that could explain how running water carved Mars' surface.

interesting.. reinvigorates the uncertainty around assumptions raised by the Feb 6th 'NASA's Curiosity Rover Sharpens Paradox of Ancient Mars' which seems to suggest ruling out past acidity as a candidate for possible carbonate sequestration, at least in the Gale deposits.
serpens
It seems that analysis of ancient rocks on both Earth and Mars has provided no evidence of greenhouse gasses as an explanation for warm wet environments under a faint young sun. When empirical evidence clashes with modelling it is prudent to re-evaluate the assumptions underpinning the model. One hypothesis that I find of interest is the possible effects of the solar system passing through interstellar dust clouds. There would be minimal attenuation of solar flux but the capture of molecular hydrogen would result in a significant increase in the sun's luminosity. McCrea, W.H. (1975). Ice Ages and the Galaxy, Nature 255, 607–609 suggests that an encounter with interstellar cloud densities of 10^5 to 10^7 H2/cm3 would increase the Sun’s luminosity by up to 100 percent during the course of an encounter.
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