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High-Silica 'halos' Shed Light on Wet Ancient Mars
Pale zones called "halos" border bedrock fractures visible in this 2015 image from NASA's Curiosity Mars rover. Measurements overlaid on the image offer a sense of scale for the size of these fractures.
Credit: NASA/JPL-Caltech
Pale "halos" around fractures in bedrock analyzed by NASA's Curiosity Mars rover contain copious silica, indicating that ancient Mars had liquid water for a long time.
From Jet Propulsion Laboratory/NASA
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