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mars-impact.jpg

Mars bears the scars of five giant impacts, including the ancient giant Borealis basin (top of globe), Hellas (bottom right), and Argyre (bottom left) Image Courtesy of University of Arizona/LPL/Southwest Research Institute Mars bears the scars of five giant impacts, including the ancient giant Borealis basin (top of globe), Hellas (bottom right), and Argyre (bottom left). An SwRI-led team discovered that Mars experienced a 400-million-year lull in impacts between the formation of Borealis and the younger basins.
Image Courtesy of University of Arizona/LPL/Southwest Research Institute