Kodachrome by Bruce Dale.
From “Mars,” written by Carl Sagan, National Geographic, December, 1967.
Puff soft “Mars dust” — actually samples of earth’s own iron oxides on a sheet of glass — frame author Carl Sagan, who believes that Voyager will find the Martian surface powdered with such rustlike substances. Today, knowledge of mars remains a matter of scientific inference; in this article Dr. Sagan presents his views. His credentials: Assistant Professor of Astronomy at Harvard, staff member of the Smithsonian Astrophysical Observatory, and consultant to the National Aeronautics and Space Administration, the Air Force, and the National Academy of Sciences.