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Over a dozen engineers and technicians in white and blue cleanroom smocks and bonnets look over the Spirit rover in JPL's large spacecraft assembly room. The solar panels are down so the team can delicately place solar cells on the rover 'wings.'  These cells absorb sunlight, which powers the rover.

This image is a bird's eye view of a group of engineers and technicians who are working on placing solar cells on the Spirit rover's "wings" in JPL's spacecraft assembly facility.

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