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These strange-looking landscape features form at Mars' south pole in springtime. They're created when frozen carbon dioxide turns to gas in the rising temperatures. Image Credit: NASA/JPL-Caltech/University of Arizona
As Spring approaches, temperatures gradually warm. Sunlight passes through the translucent frozen layer of CO2, warming the ground beneath it. This HiRISE image shows different dark shapes and bright spots on sand dunes in Mars’ north pole region. The bright spots are where frozen CO2 sublimated into gas and erupted, spreading darker material on the surface. Image Credit: NASA/JPL-Caltech/Univ. of Arizona
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