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Workers in the Payload Hazardous Servicing Facility secure the lower sections of the transport canister around the Mars Exploration Rover 2 (MER-2). The upper portion waits at left. After encapsulation, MER-2 will be transferred to Launch Complex 17-A, Cape Canaveral Air Force Station. MER-2 is one of NASA's twin Mars Exploration Rovers designed to study the history of water on Mars. These robotic geologists are equipped with a robotic arm, a drilling tool, three spectrometers, and four pairs of cameras that allow them to have a human-like, 3D view of the terrain. Each rover could travel as far as 100 meters in one day to act as Mars scientists' eyes and hands, exploring an environment where humans can't yet go. MER-2 is scheduled to launch no earlier than June 8 as MER-A aboard a Delta II rocket.