Axel Heiberg Island..
Posted on 08/03/2020 1:39:05 PM PDT by BenLurkin
A large number of the valley networks scarring Mars’s surface were carved by water melting beneath glacial ice, not by free-flowing rivers as previously thought, according to new UBC research published today (August 3, 2020) in Nature Geoscience. The findings effectively throw cold water on the dominant “warm and wet ancient Mars” hypothesis, which postulates that rivers, rainfall, and oceans once existed on the red planet.
To reach this conclusion, lead author Anna Grau Galofre, former PhD student in the department of earth, ocean and atmospheric sciences, developed and used new techniques to examine thousands of Martian valleys. She and her co-authors also compared the Martian valleys to the subglacial channels in the Canadian Arctic Archipelago and uncovered striking similarities.
The similarity between many Martian valleys and the subglacial channels on Devon Island in the Canadian Arctic motivated the authors to conduct their comparative study. “Devon Island is one of the best analogs we have for Mars here on Earth — it is a cold, dry, polar desert, and the glaciation is largely cold-based,” says co-author Gordon Osinski, professor in Western University’s department of earth sciences and Institute for Earth and Space Exploration.
In total, the researchers analyzed more than 10,000 Martian valleys, using a novel algorithm to infer their underlying erosion processes. “These results are the first evidence for extensive subglacial erosion driven by channelized meltwater drainage beneath an ancient ice sheet on Mars,” says co-author Mark Jellinek, professor in UBC’s department of earth, ocean, and atmospheric sciences.
(Excerpt) Read more at scitechdaily.com ...
“Novel algorithm” ping
LOL. “developed and used new techniques....”. Techniques designed to get the results they want?
A few photos and a few meter kicks and now they know everything! And just in time for Grant season too.
Would it not be logical to assume that at some point between surface glaciers and all subterranean water there was free flowing liquid water on the surface?
When I used to live there it was quite warm. We had a great house right on the edge of the Valles Marineris.
But we were pretty boring. We just called it the Grand Canyon. The gliders that used the edge as a launching point got to be a real nuisance, though. The updraft was strong enough that cities were built along the edge and one could go from city to city, over hundreds of miles, gliding all the way.
The low gravity helped too.
The fact that there was once liquid water at all says that Mars at least had a thicker atmosphere at one time.
Former PhD student?
Edgar Rice Burroughs had a documentary about this. He sent his friend John Carter there. Quite a time he had.
Axel Heiberg Island..
cue Obama: “Settled Science!” proclamation.
You’re not the expert, therefore you have no say in the matter.
The Left, the “state” tells us what is so, and if you question their ‘changes’ then you need ‘reeducation’.
Go to wikipedia and look up the geological history of Venus.
Scientists can tell you everything about Venus based on a couple crafts that orbited or landed on the planet and functioned a couple minutes.
Thanks BenLurkin .
A large number of the valley networks scarring Mars’s surface were carved by water melting beneath glacial ice, not by free-flowing rivers as previously thought...
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Yes, life was good on Barsoom.
“and the glaciation is largely cold-based”
...uh, isn’t all glaciation cold-based by definition?
Col. Wilder and friends had to show up and try to modernize the old planet.
Sub glacial erosion resulting from running water.
Most people would call that a stream or river...
A "large number of valley networks" is not *all* valley networks. There is ample evidence of ancient rivers and lakes, for example, the layered sedimentary rock formations, river deltas, islands streamlined from flow, and meandering riverbeds. The laser altimeter shows ancient shorelines at uniform elevations.
This article is all wet.
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