SpaceSurging groundwater solves Martian 'evaporite' mystery NASA's Opportunity rover found abundant water-altered minerals in Meridiani Planum, but how water pooled on the sloping plain was a mystery News
SpaceMars rover nears 'bathtub ring of blueberries' NASA's Opportunity rover has turned up a bumper crop of the tiny spheres around the rim of Victoria Crater – inside there may be more in a ring, suggesting only subsurface water altered the region News