Camera scan from the surface of Mars taken by the Viking 1 Lander, 1976.
© National Aeronautics & Space Administration / Science & Society
Two Viking spacecraft landed on the surface of Mars in 1976. Viking 1, launched on 20th August 1975, touched down in the Chryse Planitia region on 20th July 1976, and Viking 2, launched on 9th September 1975, landed in the Utopia Planetia region on 3rd September 1976. They returned many such pictures of the Martian surface as well as carrying out experiments to search for life. No life forms were found.