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Stories about: hydrothermal system

Spirit Stumbles Upon Pure Silica on Mars After a long hibernation period during its second Mars winter in the northern regions of the Home Plate, NASA's Mars Exploration Rover Spirit is again on the move and is now investigating the Gusev Crater where it found what appears to be a deposit of pure silica similar to the one created around hydrothermal ve... 23 May 2008 05:35 GMT