Pioneer_10-11_-_P56_-_fx.jpg - Wikipedia

Summary

Description Pioneer 10-11 - P56 - fx.jpg	English: Twelve panels of pressurized cell detectors mounted on the back of the main dish antenna record penetrating impacts of small meteoroids. In this image is a single cell detector.
Source	http://history.nasa.gov/SP-349/ch4.htm
Author	NASA

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