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"Early Mars was a watery world, but as the planet's climate changed this water retreated below the surface to form pools and 'groundwater'," Salese said in a press release.
"We traced this water in our study, as its scale and role is a matter of debate, and we found the first geological evidence of a planet-wide groundwater system on Mars."
Most previous studies on Mars relevant groundwater have proposed models, but few have looked at the geological evidence of groundwater up welling in deep closed basins in the northern hemisphere equatorial region.
Geological evidence of groundwater upwelling in these deep basins is a key point that will help to validate present‐day models and to better constraint them in the future.
Observations in the northern hemisphere show evidence of a planet‐wide groundwater system on Mars. The elevations of these water‐related morphologies in all studied basins lie within the same narrow range of depths below Mars datum and notably coincide with the elevation of some ocean shorelines proposed by previous authors.
originally posted by: bobs_uruncle
a reply to: LookingAtMars
Space and airborne mapping technologies provide a probability of whatever is being searched for, it's not 100% evidence. Evidence of groundwater in this case would be sinking a borehole and bringing it to the surface. Don't get me wrong,, I think there is a fairly high probability of liquid groundwater on mars, that hasn't yet boiled off due to vacuum pressure (anyone with a still for alcohol probably knows how to separate ethanol form water using a partial vacuum), but measurements from mapping toys are not evidence, the are guesses.
Cheers - Dave
originally posted by: LookingAtMars
a reply to: PhyllidaDavenport
I think the prevailing theory is that Mars lost it's magnetic field due to it's core becoming inactive and the atmosphere was stripped away by the solar wind.
Scars very similar to those pictured in the right hand column of this page appear on a number of different planets. Such scars tend to defy traditional explanations. For example.
Many craters tend to be almost perfectly spherical. Impact craters very rarely achieve this.
Some of the craters exhibit internal spiral patterns. Impact craters don't do this.
Crater chains often appear in straight lines. The chances of this happening are close to zero.
Channels begin and end out of nowhere.
Channels tend to be predominantly flat floored, ending with steep walls.
Channels often criss-cross, ignoring pre-existing channels. Liquids don't do this.
Channels often run up hill. Again, liquids do not tend to do this.
Many planetary rilles run for thousands of miles in almost straight lines or wave like patterns.
Missing debris. Assuming some of the features are produced by traditional methods, where did the material that has been removed go to?
Most of these electrical features are reproducible in the lab.
Sometimes these features are explained away as lava flows, or collapsed lave tubes, even where there is little evidence for any other volcanic activity. Wind and water may also be cited, but typically the planets concerned are supposed to be dry, or at least have been for many millions of years.
It is also interesting to note that many meteorites hit the earth without producing craters, and that we find many craters with no evidence of any impact! 'Weld like' scars Planetary scars