This subframe image from the left Mast Camera (Mastcam) on NASA's Mars rover Curiosity shows the covers in place over two sample inlet funnels of the rover's Sample Analysis at Mars (SAM) instrument suite.
Curiosity delivered SAM's first soil sample on the day this image was taken, the 93rd Martian day, or sol, of the mission (Nov. 9, 2012).
NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology, Pasadena, manages the Mars Science Laboratory Project for NASA's Science Mission Directorate, Washington. JPL designed and built the rover.
For more information about Curiosity and its mission, visit: http://www.nasa.gov/msl and http://mars.jpl.nasa.gov/msl.