Pegasus (satellite)
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The Pegasus Project was a NASA initiative to study the frequency of micrometeoroid impacts on spacecraft by means of a constellation of three satellites launched in 1965.
All three Pegasus satellites were launched by Saturn I rockets, and remained connected with their upper stages.
Pegasus satellite, attached to the S-IV upper stage
Micrometeoroid
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A micrometeoroid is a tiny meteoroid: a small particle of rock in space, usually weighing less than a gram. A micrometeorite is such a particle that survives passage through Earth's atmosphere and reaches Earth's surface.
Micrometeorite, collected from the Antarctic snow, was a micrometeoroid before it entered the Earth's atmosphere
Lunar sample 61195 from Apollo 16 textured with "zap pits" from micrometeorite impacts
Electron micrograph image of an orbital debris hole made in the panel of the Solar Max satellite
The "energy flash" of a hypervelocity impact during a simulation of what happens when a piece of orbital debris hits a spacecraft in orbit