It is a scientific certainty that Mars was once a much different place, with a denser atmosphere, warmer temperatures, and where water once flowed. Evidence of this past is preserved in countless surface features, ranging from river channels and alluvial deposits to lakebeds.
on Mars is confined to the polar ice caps, these landforms can be found in non-polar regions all across the planet. This feature was photographed by the High-Resolution Imaging Science Experiment , the main camera aboard the MRO. The full-sized image offers a wider perspective and shows how the glacial deposit flowed downhill.
The black and white image measures 5 km across and shows linear ridges along the surface, exposed rocky debris, and infilling inside the floors of adjacent craters and valleys. This is similar to what is observed on Earth, where glaciers pick up rocks and soil from the landscape and carry it on their surfaces and subsurface. This allows"rock glaciers" to deposit material as they gradually retreat and flow downhill over many thousand years .
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