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The Space Shuttle Columbia commemorative plaque, which was affixed to the Spirit Mars Exploration Rover. The plaque reads

In Memoriam

To the crew of the Space Shuttle Columbia STS-107. February 1, 2003.

Rick D. Husband
William C. McCool
Michael P. Anderson
Kalpana Chawla
David M. Brown
Laurel B. Clark
Ilan Ramon