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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High-Silica 'halos' Shed Light on Wet Ancient Mars
By Jet Propulsion Laboratory/NASA
May 31, 2017
![[article image]](https://cacm.acm.org/system/assets/0002/7517/53117.jpl.nasa.bedrock_fractures_mars.large.jpg?1496244307&1496244307 "Bedrock fractures on Mars")
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