Soviet Mars probes were not a success story. Mars 1, 2, 3, 4, 5 was sentout but Mars-1 was too far from Mars with no useful information, 2 and 3 became Mars satellites but only gave limb images, no surface photos. Mars-4 had 20 low resolution (1 km/px) images. The most succesful probe was Mars 5 oribiting […]