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The top image shows parabolic-shaped echoes from the rim walls of a buried impact basin. In the lower image, parabolic echoes project to circular arcs on the surface and indicate the location of a 210-kilometer-diameter (130-mile-diameter) impact basin buried by young lava flows in the Amazonis Planitia region.
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Echoes of a Buried Basin in Amazonis Planitia

The top image is a radargram presenting data collected by the Mars Advanced Radar for Subsurface and Ionospheric Sounding during the 1,886th orbit of the European Space Agency's Mars Express orbiter. It shows parabolic-shaped echoes from the rim walls of a buried impact basin. In the lower image, parabolic echoes project to circular arcs on the surface and indicate the location of a 210-kilometer-diameter (130-mile-diameter) impact basin buried by young lava flows in the Amazonis Planitia region.

The Mars Advanced Radar for Subsurface and Ionospheric Sounding is an instrument on the European Space Agency's Mars Express orbiter. NASA and the Italian Space Agency jointly funded the instrument.

Credit: ASI/NASA/ESA/JPL-Caltech/Univ. of Rome

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