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Martian glaciers are mostly pure ice across the Red Planet, suggesting they might potentially be useful resources for any explorers that might land there one day, a new study finds.

For decades, scientists have often seen glaciers coated in dust on the slopes of the mountains of Mars. Previous research suggested these were either glaciers that were comprised mostly of rock and as little as 30% ice, or debris-covered glaciers that were more than 80% ice.