Foot-dragging Mars Rover Finds Yellowstone-like Hot Spring Deposits

An ancient Martian hydrothermal system like those in Yellowstone National Park has been discovered on Mars. 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.

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