is showing scientists that it has an older, craggier face buried beneath its surface from probes by the Express MARSIS, the first sub-surface sounding radar used to explore a planet provide important new clues about the still mysterious geological history of Mars. Observations by MARSIS' "x-ray vision" strongly suggest that ancient impact craters lie buried beneath much of the smooth, low plains of the northern hemisphere of Mars. Image left shows subsurface echoes from Chryse Planitia plains.
Posted by Casey Kazan.
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