Deposits of nearly pure silica discovered by the Mars Exploration Rover Spirit in Gusev Crater formed when volcanic steam or hot water (or maybe both) percolated through the ground. Such deposits are found around hydrothermal vents like those in Yellowstone National Park ...> Full Article
In the three-and-a-half years that they've been on Mars, the NASA rovers Spirit and Opportunity have never seen anything like this: a large-scale dust storm that has darkened the skies and put the rovers in the gravest danger they have yet faced. ...> Full Article
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