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CAPTION ONLY: MERCURY DISPLAYS ITS FACE AND POLES

The heavily cratered face of the planet Mercury is shown in a computer-enhanced photomosaic taken by Mariner 10 on March 9, 1974. This photo is among more than 400 photos of the little planet in an atlas released by NASA. At right, radio frequency images reveal the existence of two "hot poles" along Mercury's equatorial belt. The darkest spots indicate the highest temperatures. The light area surrounding the hot spot indicates intermediate temperatures and the gray border the lowest temperatures.