Martian landscape taken by a Viking Lander, 1976.
© National Aeronautics & Space Administration / Science & Society
This shows the red surface of the planet and part of the lander itself. Two Viking spacecraft were launched towards Mars in 1975, each carrying a lander spacecraft and an orbiter. Both succesfully landed their probes on Mars to study the Martian environment, soil constituents and to search for simple life forms - none were found.