image: A ground-range projection of the radargram for MARSIS orbit 1892 that crosses the Martian lowland plains of Chryse Planitia. Rim walls and interior ring structures of impact basins produce parabolic-shaded echoes. The inset shows that parabolic-shaped echoes in the radargram project to circular arcs, indicating the presence of a buried impact basin. view more
Credit: ASI/NASA/ESA/Univ. of Rome/JPL/Smithsonian Institution Copyright: Smithsonian Institution