With less than a year to go before the launch of NASA’s Mars Exploration Rover mission, scientists have spent the last few weeks at a high-tech summer camp, rehearsing their roles for when the spacecraft take center stage. “The purpose of this test is really to teach the science team how to remotely conduct field geology using a rover, rather than to test the rover hardware,” said Dr. John Callas, science manager for the Mars Exploration Rover mission at NASA’s Jet Propulsion Laboratory, Pasadena, California.