NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Mariner 10 photograph of the surface of Mercury, the innermost planet, showing the impact crater Degas, surrounded by its bright-rayed ejecta blanket. The black region above and to the left of this is an area not photographed by the spacecraft. Mariner 10 was the first spaceprobe to visit Mercury, making three separate encounters during 1974-5.
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