NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Mars. Coloured Viking orbiter image of the southern polar region of Mars superimposed on a starfield. Clouds and dust in the tenuous Martian atmosphere (purple) are seen above the limb. This view is over the Argyre Planitia basin, a large impact crater. The Viking spacecraft were launched in August (Viking 1) and September (Viking 2) 1975. They gathered over 50,000 images of Mars.
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