Enhanced Color Caloris
The image above shows the Caloris basin on Mercury and it is one of the solar system's largest impact basins (created during early history of the solar system by the impact of a large asteroid-sized body). The basin is about 1,500 kilometers and it is Mercury's youngest large impact basin. The image above has enhanced color and is created as a mosaic based on image data from the Mercury-orbiting MESSENGER spacecraft. In this picture, the orange is where lava once filled and the blue areas are part of the original basin. The orange splotches around the basin's perimeter are thought to be volcanic vents.
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