The 10 most groundbreaking science missions NASA's ever sent to space.
Mars Rovers Spirit and Opportunity are 6-wheeled, remotely operated explorers on the planet Mars. Learn more about Mars exploration and how the Spirit and Opportunity rovers are doing.
Loose soil piled against a low plateau has blocked NASA’s Mars Exploration Rover Spirit from taking the shortest route to its summer destinations.
Phoenix, MRO, and rovers studied Mars' surface looking for signs of water and potential habitability.