More resources
Viking 40 Year Anniversary Artwork: Medal

July 20, 2016
Artwork commemorating the 40th anniversary of the Viking 1 and 2 missions to Mars. Each had an orbiter and lander pair. The Viking 1 Orbiter arrived at Mars on June 19, 1976, and the Viking 1 Lander was the first to touch down on Mars on June 20, 1976. The Viking 2 Orbiter arrived at Mars on August 7, 1976, and the Viking 2 Lander successfully touched down on September 3, 1976.
Credits
NASA