Dr. Geoffrey A. Landis, an aerospace engineer at NASA’s Glenn Research Center, Cleveland, thinks he knows what it takes to explore Mars. And the Agency believes him. Landis’ proposal, “Study of Solar Energy and Dust Accumulation on the Rovers,” was one of 28 scientific studies of Mars recently selected by NASA for the 2003 Mars Exploration Rover Mission. His proposal calls for the use of Mars Exploration Rover (MER) instrumentation to study the intensity, spatial and spectral distribution of solar energy on the Mars surface, and to compare the measured values with various models of solar distribution.