Viking
Space Viking stamps connect collectors to one of the most celebrated chapters of Mars exploration. NASA's Viking program sent two spacecraft, each with an orbiter and lander, to the red planet in the mid-1970s, and both landers touched down successfully in 1976. The missions returned detailed images of the Martian surface and carried experiments designed to search for signs of life. For topical collectors, Space Viking stamps capture the ambition and ingenuity of early planetary exploration.