... Credit: Mars Exploration Rover Mission , JPL , NASA Explanation: Was Mars ever wet enough to support life? To help answer this question, NASA launched two rover missions to the red planet and landed them in regions that satellite images indicated might have been covered with water. ... Visible is some of the light rock outcropping that yielded water indications, as well as the rim of the small crater where Opportunity landed . ... Publications with keywords: Mars - Opportunity rover - water . ...