Technicians test the robotic arm of NASA's Mars Science Laboratory rover 'Curiosity', where it is undergoing pre-flight tests in the 'clean room' of the spacecraft assembly facility, at the Jet Propulsion Laboratory in Pasadena, California, Sept 16, 2010. The Mars Science Laboratory rover about the size of a Mini-Cooper automobile, is due to be launched on its mission to Mars late 2011, arriving on Mars in August 2012. [Agencies]

The nuclear battery of NASA's Mars Science Laboratory rover 'Curiosity' is shown (R) on the spacecraft which is undergoing pre-flight tests in the 'clean room' of the spacecraft assembly facility at the Jet Propulsion Laboratory in Pasadena, California, Sept 16, 2010.  [Photo/Agencies]