Keywords: mars nasa jpl mro university of arizona universityofarizona landscape geology science space blackandwhite monochrome texture organic pattern abstract pattern depth of field outdoor black and white Secondary Craters: Secondary impact craters are both interesting and vexing, but can be used to constrain the age of the surface where they fell. NASA/JPL/University of Arizona (5 km across; www.uahirise.org/nea.php) Secondary Craters: Secondary impact craters are both interesting and vexing, but can be used to constrain the age of the surface where they fell. NASA/JPL/University of Arizona (5 km across; www.uahirise.org/nea.php) |