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The Viking Mission to Mars launched two spacecraft, Viking 1 and Viking 2, each consisting of an orbiter and a lander. The primary mission objectives were to obtain high resolution images of the Martian surface, characterize the structure and composition of the atmosphere and surface, and search for evidence of life. The spacecraft were launched in 1975 and arrived at Mars in 1976. The first month of orbit was devoted to imaging the surface to find appropriate landing sites for the Viking Landers. The Viking 1 Lander touched down at Chryse Planitia. The Viking 2 Lander touched down at Utopia Planitia. The Orbiters imaged the entire surface of Mars.