 Many grooves and streaks also cover the oddly shaped surface.The grooves are typically less than deep, wide, and up to in length, and were originally assumed to have been the result of the same impact that created Stickney.Analysis of results from the "Mars Express" spacecraft, however, revealed that the grooves are not in fact radial to Stickney, but are centered on the leading apex of Phobos in its orbit (which is not far from Stickney).