A heat tile  
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A heat tile
DSC02136.jpeg, EXIF 2368 KB JPEG image, 3264 x 2448 pixels
These are made of silicia, are mostly air by volume, and weigh amazingly little because of this.
Date: 2010-05-13T16:50:47-0400
Location: Bay 1, Orbiter Processing Facility, Kennedy Space Center, FL
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