Keywords: mars nasa jpl mro university of arizona universityofarizona landscape geology science space blackandwhite monochrome texture outdoor black and white Spiders on Mounds: This landform is uniquely Martian, formed in the spring as seasonal dry ice turns directly into gas NASA/JPL/University of Arizona (5 km across; www.uahirise.org/nea.php) Spiders on Mounds: This landform is uniquely Martian, formed in the spring as seasonal dry ice turns directly into gas NASA/JPL/University of Arizona (5 km across; www.uahirise.org/nea.php) |