Commercial Space Hastens, Big Space Slows. Canals of Mars. Bob Zimmerman, Behindtheblack.com.

Sep 16, 2016, 04:18 AM

09-15-2016 (Photo: This map of an area within the Arabia Terra region on Mars shows where hydrologic modeling predicts locations of depressions that would have been lakes (black), overlaid with a map of the preserved valleys (blue lines, with width exaggerated for recognition) that would have been streams. The area today holds numerous features called "fresh shallow valleys." Research findings in 2016 interpret the fresh shallow valleys as evidence for flows of liquid water that occurred several hundred million years -- up to about a billion years -- after the ancient lakes and streams previously documented on Mars. Most of the fresh shallow valleys in this northern portion of Arabia Terra terminate at the margins of model-predicted submerged basins, consistent with an interpretation of flows into lakes and out of lakes. Some valley segments connect to form longer systems, consistent with connections forged by flowing water between interspersed lakes. In the area mapped here, for example, valleys connect basin "A" to basin "B," and basin B to "Heart Lake," each lower in elevation in that chain. Detail of the valley interpreted as the northward outflow channel from basin B can be seen in the image at PIA20837. Relative topography of the region is mapped at PIA20838.) http://JohnBatchelorShow.com/contact http://JohnBatchelorShow.com/schedules http://johnbatchelorshow.com/blog Twitter: @BatchelorShow

Commercial Space Hastens, Big Space Slows. Canals of Mars. Bob Zimmerman, Behindtheblack.com.

"New evidence of lakes and streams in Mars’ recent past September 15, 2016 at 1:26 pm Robert Zimmerman Using data from three different orbiters scientists have mapped out a region of lakes and streams on Mars that appear to have contained liquid water a billion years after the red planet is believed to have dried up. To bracket the time period when the fresh shallow valleys in Arabia Terra formed, scientists started with age estimates for 22 impact craters in the area. They assessed whether or not the valleys carved into the blankets of surrounding debris ejected from the craters, as an indicator of whether the valleys are older or younger than the craters. They concluded that this fairly wet period on Mars likely occurred between two and three billion years ago, long after it is generally thought that most of Mars’ original atmosphere had been lost and most of the remaining water on the planet had frozen.

The characteristics of the valleys support the interpretation that the climate was cold: “The rate at which water flowed through these valleys is consistent with runoff from melting snow,” Wilson said, “These weren’t rushing rivers. They have simple drainage patterns and did not form deep or complex systems like the ancient valley networks from early Mars.” This region, Arabia Terra, is the same area where scientists have found fossilized rivers."

http://behindtheblack.com/behind-the-black/points-of-information/new-evidence-of-lakes-and-streams-in-mars-recent-past/