NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Viking 1 spacecraft photograph of Mars. The picture shows the giant volcano Olympus Mons at top right, the 3 volcanos forming the Tharsis Mountains at centre right, & the dark smudge of the Argyre impact basin at lower right. The picture was taken from a distance of 560,000 km on June 17, 1976, as Viking 1 approached the planet.
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