Sample material from the fourth scoop of Martian soil collected by NASA's Mars rover Curiosity is on the rover's observation tray in this image taken during the mission's 78th Martian sol, (Oct. 24, 2012) by Curiosity's left Navigation Camera.

Sample material from the fourth scoop of Martian soil collected by NASA's Mars rover Curiosity is on the rover's observation tray in this image taken during the mission's 78th Martian day, or sol, (Oct. 24, 2012) by Curiosity's left Navigation Camera.

The tray is 3 inches (7.8 centimeters) in diameter.

JPL manages the Mars Science Laboratory/Curiosity for NASA's Science Mission Directorate in Washington. The rover was designed, developed and assembled at JPL, a division of the California Institute of Technology in Pasadena.

For more about NASA's Curiosity mission, visit: http://www.jpl.nasa.gov/msl, http://www.nasa.gov/mars, and http://marsprogram.jpl.nasa.gov/msl.

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