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High-Silica 'halos' Shed Light on Wet Ancient Mars


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Bedrock fractures on 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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