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Many martian craters show more than one ejecta lobe surrounding the crater. Arandas, the 24.5-km-multilobate crater seen in this image, is located in the mottled terrain, a region near the martian north pole where craters are typically surrounded by bright halos of material. These bright halos appear to be clean ice deposited as ejecta on the dirtier surface. To the right of the crater is an example of the polygonal terrain, the origin of which has been variously attributed to ice, volcanism, and tectonism. Crater at 42.53°
N, 14.97° W; Viking Orbiter frame 673B52 Right
click here to download a high-resolution version of the image (2.41 MB)
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