Mariner 9 became Mars first artificial satellite. Once it arrives there was a huge dust storm that went on for a month. After it blew over the rover saw huge volcanoes and a large canyon that was about 4,800 kilometers long. Then, the rover mapped out the whole surface of Mars with its camera. Also, this rover showed the first close-up pictures of Mar's two moons named Phobos and Deimos. In all it came back with 7,329 images.