An image taken by the HiRISE camera aboard NASA's MRO shows evidence of past glaciers away from Mars' polar regions.
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. However, roughly 4 billion years ago, the planet began to change into what we see today, an extremely cold and desiccated environment.
Full-size image taken by HiRISE of the rough terrain thought to be caused by a retreating glacier on Mars. Credit: NASA/JPL-Caltech/University of Arizona 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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