Mars Dirt Points to Water

While exploring the great red planet, Spirit, that spunky little rover, knocked over some dirt that relaved a lot of (90%) silica. This is strong evidence added to that already found that Mars was once a wet planet.

Spirit and Oportunity are 3 years over their orginal 3 month mission. One or poor Spirit's wheels has stopped rolling. That is what caused this discovery, the dragging of one wheel across the ground.