From the "Viking Archive" - Viking 2: frost and blue sky

Caption NASA originale:"Viking Lander 2 is far enough North that frost deposits form on the surface during Winter. This image, taken in May 1979, shows a thin, white layer of water frost, estimated to be only microns thick, covering parts of the surface. The reddish regions are soil and rock not covered by the frost. Portions of the spacecraft are visible in the right foreground".

(Courtesy NASA/LPI)

E del cielo?
Cosa diciamo del cielo, così splendidamente azzurrino?
Attenzione: questa fotografia è in "true colors"!!!