The geologically recent giant impact basins at Vesta's south pole.

@article{Schenk2012TheGR,
  title={The geologically recent giant impact basins at Vesta's south pole.},
  author={P M Schenk and D. P. O'brien and Simone Marchi and Robert W. Gaskell and F Preusker and T Roatsch and Ralf Jaumann and Debra L. Buczkowski and T. McCord and Harry Y. Jr. Mcsween and David Williams and Aileen Yingst and Carol A. Raymond and Chris Russell},
  journal={Science},
  year={2012},
  volume={336 6082},
  pages={
          694-7
        }
}
Dawn's global mapping of Vesta reveals that its observed south polar depression is composed of two overlapping giant impact features. These large basins provide exceptional windows into impact processes at planetary scales. The youngest, Rheasilvia, is 500 kilometers wide and 19 kilometers deep and finds its nearest morphologic analog among large basins on low-gravity icy satellites. Extensive ejecta deposits occur, but impact melt volume is low, exposing an unusual spiral fracture pattern that… CONTINUE READING

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