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LDEFLong Duration Exposure Facility
LDEFLegal Defense and Education Fund
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Early looks at test samples left in space for nearly six years aboard NASA's Long Duration Exposure Facility (LDEF) have revealed surface scars from microscopic meteoroids, thin layers of various materials that were either partially degraded or eroded away, and other signs of damage from the space environment.
Shuttle astronauts this year should make the long-overdue pickup of a device called the Long Duration Exposure Facility (LDEF), which has been waiting passively in orbit since astronauts put it there in 1984.