Cartography work carried out by http://www.usgs.gov/blogs/features/usgs_top_story/new-usgs-map-of-mars-is-most-detailed-one-yet/ have revealed further proof of ancient lake beds and signs of Mars-quakes in the Valles marineris region.
A shorter pressrelease from http://www.jpl.nasa.gov/news/news.php?feature=4408.
Warming by asteroid impacts might yield a too transient warming to explain the erosion seen on Mars, now http://news.psu.edu/story/440075/2016/12/01/research/climate-cycles-may-explain-how-running-water-carved-mars-surface created somewhat warmer longer periods that could explain how running water carved Mars' surface.
CNRS, Laboratoire de Planétologie et Géodynamique de Nantes, France: https://planetarygeomorphology.wordpress.com/2013/09/16/moraines-left-by-carbon-dioxide-glaciers-on-mars/.
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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