Viking 1 on Mars, 1976.
© National Aeronautics & Space Administration / Science & Society
This shows the red Martian landscape and the arm of the Viking Lander used to collect soil samples for on-board analysis. Viking 1 was launched on 20th August 1975 and landed in the Chryse Planitia region of Mars on 20th July 1976, where it studied the Martian environment, soil constituents and searched for simple life forms - none were found. Viking 1 returned data to Earth until November 1982.