Waspie_Dwarf Posted July 29, 2016 #1 Share Posted July 29, 2016 (edited) Mars Gullies Likely Not Formed by Liquid Water Quote New findings using data from NASA's Mars Reconnaissance Orbiter show that gullies on modern Mars are likely not being formed by flowing liquid water. This new evidence will allow researchers to further narrow theories about how Martian gullies form, and reveal more details about Mars' recent geologic processes. Scientists use the term "gully" for features on Mars that share three characteristics in their shape: an alcove at the top, a channel, and an apron of deposited material at the bottom. Gullies are distinct from another type of feature on Martian slopes, streaks called "recurring slope lineae," or RSL, which are distinguished by seasonal darkening and fading, rather than characteristics of how the ground is shaped. Water in the form of hydrated salt has been identified at RSL sites. The new study focuses on gullies and their formation process by adding composition information to previously acquired imaging. Read more: NASA Edited August 24, 2016 by Waspie_Dwarf added tag. 1 Link to comment Share on other sites More sharing options...
jethrofloyd Posted August 1, 2016 #2 Share Posted August 1, 2016 Gullies on Mars were NOT carved by liquid water: Red planets' mysterious scratches may have been created by carbon dioxide http://www.dailymail.co.uk/sciencetech/article-3717862/Massive-gullies-Mars-NOT-carved-liquid-water-Red-planets-mysterious-scratches-created-carbon-dioxide.html#ixzz4G4xoD9WL The surface of Mars is covered with narrow, deep channels known as gullies. Exactly how these gullies formed is not fully understood - previous research had suggested the structures were a result of flowing liquid water, because water makes similar structures on Earth. But new research shows water is not behind the Martian gullies, instead suggesting they could be created by carbon dioxide freezing and thawing. Link to comment Share on other sites More sharing options...
Waspie_Dwarf Posted August 24, 2016 Author #3 Share Posted August 24, 2016 Test for Damp Ground at Mars' Seasonal Streaks Finds None Quote Seasonal dark streaks on Mars that have become one of the hottest topics in interplanetary research don't hold much water, according to the latest findings from a NASA spacecraft orbiting Mars. The new results from NASA's Mars Odyssey mission rely on ground temperature, measured by infrared imaging using the spacecraft's Thermal Emission Imaging System (THEMIS). They do not contradict last year's identification of hydrated salt at these flows, which since their 2011 discovery have been regarded as possible markers for the presence of liquid water on modern Mars. However, the temperature measurements now identify an upper limit on how much water is present at these darkened streaks: about as much as in the driest desert sands on Earth. Read more: NASA 1 Link to comment Share on other sites More sharing options...
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