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Bright radar reflections at Mars' south polar cap

Bright radar reflections at Mars' south polar cap
Bright radar reflections at Mars' south polar cap The colored dots represent sites where bright radar reflections have been spotted by ESA’s Mars Express orbiter at Mars’ south polar cap. Such reflections were previously interpreted as subsurface liquid water, but their prevalence and proximity to the frigid surface suggest they may be something else. ESA/NASA/JPL-Caltech