This closeup shows the size of the computer chip that holds about 35,000 laser-engraved signatures of visitors to the Mars Exploration Rovers at the Jet Propulsion Laboratory.

April 15, 2003
Prelaunch at Kennedy Space Center

This closeup shows the size of the computer chip that holds about 35,000 laser-engraved signatures of visitors to the Mars Exploration Rovers at the Jet Propulsion Laboratory. It will be placed on the second rover to be launched to Mars; the first rover already has one. The signatures include those of senators, artists, and John Glenn. The identical Mars rovers are scheduled to launch June 5 and June 25 from Cape Canaveral Air Force Station.

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