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11-22-2017, 01:39 AM
Another thing we thought was water on Mars actually isn't water
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Back in 2011, NASA scientists announced they had spotted compelling evidence (https://www.jpl.nasa.gov/news/news.php?feature=3089) that water sometimes still flowed on Mars. Now, researchers are backpedaling on these watery conclusions.*
To NASA's credit, the 2011 evidence looked quite convincing. Images captured by the Mars Reconnaissance Orbiter — a NASA satellite orbiting Mars — showed telltale dark streaks running down various mountains, valleys, and craters on Mars. They look strikingly similar to features formed on Earth's surface by flowing water.
But, according to a new study (https://www.nature.com/articles/s41561-017-0012-5) in the journal Nature Geoscience, it turns out these dark streaks are made mostly of "granular flow" — sand and perhaps rocks falling downhill — rather than water flowing down valleys during the warmer Martian summers.* Read more... (http://mashable.com/2017/11/21/scientists-show-that-mars-features-not-carved-by-water/)
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Back in 2011, NASA scientists announced they had spotted compelling evidence (https://www.jpl.nasa.gov/news/news.php?feature=3089) that water sometimes still flowed on Mars. Now, researchers are backpedaling on these watery conclusions.*
To NASA's credit, the 2011 evidence looked quite convincing. Images captured by the Mars Reconnaissance Orbiter — a NASA satellite orbiting Mars — showed telltale dark streaks running down various mountains, valleys, and craters on Mars. They look strikingly similar to features formed on Earth's surface by flowing water.
But, according to a new study (https://www.nature.com/articles/s41561-017-0012-5) in the journal Nature Geoscience, it turns out these dark streaks are made mostly of "granular flow" — sand and perhaps rocks falling downhill — rather than water flowing down valleys during the warmer Martian summers.* Read more... (http://mashable.com/2017/11/21/scientists-show-that-mars-features-not-carved-by-water/)
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