40 years ago, Viking 1 pioneered U.S. exploration on Mars

Forty years ago, Viking 1 took this picture of its landing site (and footpad) on Mars, the first clear image from the surface of the Red Planet.
NASA, Roel van der Hoorn
Forty years ago, Viking 1 took this picture of its landing site (and footpad) on Mars, the first clear image from the surface of the Red Planet.
NASA, Roel van der Hoorn