NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Mariner 10 photograph of Mercury, the innermost planet, showing its heavily cratered surface. Mariner 10 was the first spaceprobe to visit the planet, making three separate encounters during 1974-5. This image is a mosaic constructed from photographs taken as the spacecraft approached the planet for its first fly-by on March 29, 1974.
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