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New Evidence Asserts Mars Environment Over Billions of Years Ago Was Able to Support Liquid Water

River deposits exist across Mars and a region of Mars named Aeolis Dorsa contains some of the most spectacular and densely packed river deposits seen on the Red Planet

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FILE - The base of Mars' Mount Sharp is pictured in this August 27, 2012 NASA handout photo taken by the Curiosity rover. VOA
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New York, September 19, 2017 : The Mars environment over 3.5 billion years ago was able to support liquid water at the surface, says a study.

River deposits exist across the surface of Mars and a region of Mars named Aeolis Dorsa contains some of the most spectacular and densely packed river deposits seen on the Red Planet, according to the study published in the Geological Society of America (GSA) Bulletin.

These deposits are observable with satellite images because they have undergone a process called “topographic inversion” where the deposits filling once topographically low river channels have been exhumed in such a way that they now exist as ridges at the surface of the planet, the researchers said.

ALSO READ NASA Scientists Reveal New Information on Mars’ Formation and Evolution, Claim The Red Planet has a Porous Crust

With the use of high-resolution images and topographic data from cameras on orbiting satellites, Benjamin T Cardenas and colleagues from Jackson School of Geosciences at the University of Texas at Austin, identified fluvial deposit stacking patterns and changes in sedimentation styles controlled by a migratory coastline.

They also developed a method to measure river paleo-transport direction for a subset of these ridges.

Together, these measurements demonstrated that the studied river deposits once filled incised valleys.

On Earth, incised valleys are commonly cut and filled during falling and rising eustatic sea level, respectively.

The researchers concluded that similar falling and rising water levels in a large water body forced the formation of the paleo-valleys in their study area.

“We present evidence that some of these fluvial deposits represent incised valleys carved and filled during falls and rises in base level, which were likely controlled by changes in water-surface elevation of a large lake or sea,” the study said.

They observed cross-cutting relationships at the valley-scale, indicating multiple episodes of water level fall and rise, each well over 50 metres, a similar scale to eustatic sea level changes on Earth. (IANS)

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Scientists spot massive ice deposits on Mars

Recent observations by MRO's ground-penetrating Shallow Radar instrument revealed a buried ice layer that covers more ground than the state of New Mexico.

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Scientists found layers of ice on the surface of Mars. Wikimedia Commons
  • Recently, scientists have found layers of ice on the Martian land.
  • Scientists think this ice might be a useful source of water for future humans.
  • The researchers had researched 8 locations on the surface of Mars.

Scientists have unearthed thick and massive deposits of ice in some regions on Mars.

The images taken by the High-Resolution Imaging Science Experiment (HiRISE) camera aboard NASA’s Mars Reconnaissance Orbiter (MRO) showed the three-dimensional structure of massive ice deposits on Mars.

The ice sheets extend from just below the surface to a depth of 100 meters or more and appear to contain distinct layers.

It extending downward from depths as shallow as 1 to 2 meters below the surface, which could preserve a record of Mars’ past climate, the researchers noted in the journal Science.

This ice which was found can help scientists understand the climate history of Mars. IANS
This ice which was found can help scientists understand the climate history of Mars. IANS

“We expect the vertical structure of Martian ice-rich deposits to preserve a record of ice deposition and past climate,” said Colin M. Dundas, from the US Geological Survey.

“They might even be a useful source of water for future human exploration of the red planet,” Dundas added.

The researchers investigated eight locations on Mars and found thick deposits cover broad regions of the Martian mid-latitudes with a smooth mantle.

However, erosion in these regions creates scarps that expose the internal structure of the mantle.

The scarps are actively retreating because of sublimation of the exposed water ice.

The layers of ice can be used as water source by future humans on Mars, VOA
The layers of ice can be used as water source by future humans on Mars, VOA

The ice deposits likely originated as snowfall during Mars’ high-obliquity periods and have now compacted into massive, fractured, and layered ice.

Previous researchers have revealed that the Red Planet harbours subsurface water ice.

Recent observations by MRO’s ground-penetrating Shallow Radar instrument revealed a buried ice layer that covers more ground than the state of New Mexico.

NASA’s Phoenix lander had also dug up some ice near the Martian north pole in 2008, however, it is not clear if that is part of the big sheet. IANS