Crater Gradation in Gusev Crater, Meridiani Planium and on the Earth

摘要

The Mars Exploration Rovers Spirit and Opportunity have examined multiple impact craters since landing in Gusev Crater (14.569 degrees S, 175.473 degrees E) and Meridiani Planum (1.946 degrees S, 354.473 degrees E), respectively. Craters at both locations are in varying states of preservation and comparison between their evolved gradation signatures and those around simple, unglaciated terrestrial craters provide clues to the processes and amount of Martian crater modification.