Technology Cracks on Mars Reveal a System of Ancient Lakes

13:30  21 april  2018
13:30  21 april  2018 Source:   newsweek.com

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Cracks on Mar 's surface suggests that the red planet was once very wet. Credit: Google/NASA/JPL. A series of huge cracks etched across crater basins on Mars were caused by lakes that have since evaporated, a new study concludes.

New images from NASA's Curiosity rover on Mars reveal what looks to be the first sign of mud cracks on the Martian surface, providing scientists with even more evidence that the red planet once hosted water – which "The ancient lakes varied in depth and extent over time, and sometimes disappeared.

Mars once had ancient oceans. A photo of the Valles Marineris on Mars. © NASA/ARIZONA STATE UNIVERSITY VIA GETTY IMAGES Mars once had ancient oceans. A photo of the Valles Marineris on Mars. A study published Thursday confirmed that the cracks identified on Mars' surface last year by the Curiosity rover are indeed evidence of ancient lakes that likely dried up about 3.5 billion years ago. The new study provides further evidence of what the climate on the Red Planet may have been like in its ancient past.

The study, published online in Geology, proved that cracks on Mars' surface previously photographed by Curiosity are indeed desiccation mudcracks which could have only been formed when wet sediment was exposed to the air. This conclusion was based on an analysis of a single area of rock known as “Old Soaker.”

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Research team finds definitive evidence for ancient lake on Mars . Networks of giant polygonal troughs etched across crater basins on Mars have been identified as desiccation cracks caused by evaporating lakes , providing further evidence of a warmer, wetter martian past.

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Researchers used the Curiosity rover and data from its many tools, particularly the Mars Hand Lens Imager, ChemCam Laser Induced Breakdown Spectrometer (LIBS) and the Alpha-Particle X-Ray Spectrometer (APXS) to study both the physical appearance and the chemistry of the rock, which is described as no bigger than a coffee table. 

The analysis revealed that cracks on the rocks were formed by exposure to air, rather than heat or the flow of water. In addition, the shape of the cracks suggests the occurrence of a single drying event on the planet, rather than multiple cycles of the planet getting wet and drying over. The position of the cracks, closer to the center of the ancient lake rather than along the edges, also suggests that the lake levels changed often, rising and falling dramatically over time.

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Ancient fresh water lake on Mars could have sustained life, Curiosity researchers show. December 9, 2013. Gale before Curiosity: What we knew and what the rover may reveal . September 26, 2012.

Some Ancient Mars Lakes Formed Long After Others. The recently discovered lakes and streams appeared roughly a billion years after read more. Studying Meteorites May Reveal Mars ' Secrets of Life.

"The mudcracks are exciting because they add context to our understanding of this ancient lacustrine system," lead study author Nathaniel Stein, a geologist at the California Institute of Technology in Pasadena, said in a statement, referring to the ancient lake system on the planet. 

Scientists have known of the existence of ancient water on Mars for years. A 2015 NASA study that measured water signatures in Mars’ atmosphere suggested that ancient oceans may once have had more water than our own Arctic Ocean. However, because the planet has less gravity and a thinner atmosphere than Earth, this water evaporated into space over the course of several billion years.

Water still exists on Mars in the form of ice. In 2015, NASA scientists found a slab of ice just beneath Mars' surface that was estimated to be as big as California and Texas combined.

Some have even suggested that there may still be liquid water flowing on Mars. In 2015 NASA announced that dark features that appeared to be running down slopes on Mars were running water. However, more recent research suggests that these darker slopes are just sand.

Did another advanced species exist on Earth before humans? .
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