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Dark Halos

Impact craters such as Crater Carson shown here are frequently surrounded by radar-dark halos. Several of these special craters have halos that are parabolic in shape and are very long, extending hundreds of kilometers to the west. The darkness of the emissivity data indicates a smooth surface, leading scientists to believe that halos may be thick, smooth sediment deposits formed when incoming projectiles crashed into the surface. The black strips represent missing data.

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