Over-achieving Mars rover Spirit has literally uncovered new evidence that Mars used to have a much wetter climate, thanks to a dodgy wheel.
Spirit has been on Mars for much longer than mission planners had ever hoped, and is beginning to show its age: one of its six wheels no longer rotates, instead dragging a deep furrow behind the rover as it limps across the Martian surface.
But this has meant researchers have had unexpected access to below surface samples of Martian soil. And it is from one of these samples that this discovery has come.
The rover analysed a patch of the soil it had ploughed up. It turned out to be 90 per cent pure silica. According to NASA, the processes that could have created such a high concentration of silica all "require" water.
According to the rover team, possible mechanisms for the creation of the silica include the soil interacting with the kinds of acid vapour that would be produced by volcanic activity in the presence of water, or water in a hot spring environment.
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