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Space shuttle Discovery's heat shield.

Image source [4] archive copy at the Wayback Machine. NASA's description:

ISS011-E-11084 (28 July 2005)

Discovery was about 600 feet from the International Space Station (ISS) when Station Commander Sergei Krikalev and Station NASA Science Officer and Flight Enginner John Phillips took photos for about a minute and a half as Discovery Commander Eileen Collins guided the spacecraft through the flip. Krikalvev used an 800 mm lens. The photos will be analyzed by engineers on the ground as additional data to evaluate the condition of Discovery's heat shield.