This breathtaking image of Mercury is not quite what the planet would look like to the human eye. In the image, colors enhance the chemical, mineralogical, and physical differences between the rocks that make up the planet's surface. Young crater rays, extending radially from fresh impact craters, appear light blue or white. Medium- and dark-blue areas are a geologic unit of Mercury's crust known as the "low-reflectance material", thought to be rich in a dark, opaque mineral. Tan areas are plains formed by eruption of highly fluid lavas. The giant Caloris basin is the large circular tan feature located just to the upper right of center of the image.

Image by NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

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