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Planet Mercury, photographed by Mariner 10 on March 24, 1975.

The photo is PIA00437, and can be found at ksc.nasa.gov and at the JPL Planetary Photojournal.

[edit] Original caption released with image

Mariner 10's first image of Mercury acquired on March 24, 1974. During its flight, Mariner 10's trajectory brought it behind the lighted hemisphere of Mercury, where this image was taken, in order to acquire important measurements with other instruments.

This picture was acquired from a distance of 3,340,000 miles (5,380,000 km) from the surface of Mercury. The diameter of Mercury (3,031 miles; 4,878 km) is about 1/3 that of Earth.

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