Photo Gallery: Test doubles of the Mars Rover Curiosity, Opportunity and Spirit and Sojourner at Mars Yard

NASA Test Analyst Wesley Kuykendall positions a test double for the Mars Rover Curiosity before doing a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.

NASA Test Analyst Wesley Kuykendall positions a test double for the Mars Rover Curiosity before doing a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA Robotic Arms Systems Lead Matt Robinson, left, and Test Analyst Wesley Kuykendall position a test double for the Mars Rover Curiosity before a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA photographer Dutch Slager, center, observes a test double for the Mars Rover Spirit and Opportunity and makes sure to see if it’s in the right position before doing a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA Mobility Engineer Beth Jordan, top right, signals someone to place a test double for the Mars Rover Spirit and Opportunity in its position before a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

Mars Rover Sequence Engineer for Sojourner Rick Welch, from left, Mechanical Thermo and Mobility Lead for Sojourner Howard Eisen, Mars Rover Sojourner Engineer Greg Hickey and Jennifer Knight take a look at a test double for the Mars Rover Sojourner at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA photographer Dutch Slager, left, listens to NASA Test Analyst Wesley Kuykendall as they figure out how to position a test double for the Mars Rover Curiosity before the photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA photographer Dutch Slager takes a photo of a test double for the Mars Rover Curiosity before a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

A test double for the Mars Rover Sojourner is placed next to other test doubles for the Mars Rover Spirit, Opportunity and Curiosity at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA Flight Technician Errin Dalshaug positions a test double for the Mars Rover Spirit and Opportunity in its proper position before a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

Janine Medlin, from left, Beth Jordan, NASA Flight Systems Manager Matt Wallace, NASA photographer Richard Hasegawa and Dutch Slager wait before positioining the test doubles for Mars Rover Curiosity, Spirit and Opportunity and Sojourner before a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

Wesley Kuykendall, from left, Richard Hasegawa, Dutch Slager and Beth Jordan position a test double for Mars Rover Curiosity before a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA photographer Richard Hasegawa takes photos of a test double of Mars Rover Curiosity at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

A test double of the Mars Rover Spirit and Oportunity is positioned next to another test double of the Mars Rover Curiosity at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA Test Analyst Wesley Kuykendall positions a test double of the Mars Rover Curiosity before a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA Robotic Arms Systems Lead Matt Robinson, left, and Test Analyst Wesley Kuykendall position a test double for Mars Rover Curiosity before a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA Flight Systems Manager Matt Wallace, left, and System Integration and Test Lead for Mars Rover Sojourner Eric Aguilar position the test double of the Mars Rover Sojourner before a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)

Test doubles of Mars Rover Curiosity, Spirit and Opportunity and Sojourner at Mars Yard

NASA Robotic Arms Systems Lead Matt Robinson, left, and Test Analayst Wesley Kuykendall position a test double for the Mars Rover Curiosity before a photo shoot at NASA JPL in Pasadena on Thursday, December 15, 2011.  (Cheryl A. Guerrero/Staff Photographer)