Pioneer 10's famed Plaque features a design engraved into a gold-anodized aluminum plate, 152 by 229 millimeters (6 by 9 inches), attached to the spacecraft's antenna support struts to help shield it from erosion by interstellar dust
From http://www.nasa.gov/centers/ames/news/releases/2001/01images/Pioneer10/pioneer10.html
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