S-49 Satellite Gegenschein Experiment Electronics module, measuring 7.5″ x 8″ x 6.5″, with a tag applied to one panel: "Gegenschein Photometry, GSFC/ITTIL, Mission S-49, Part No. 4704527-GI, Serial No. FU2." The sides have serial ports marked "B-1," "B-2," and "B-3." The module's wiring is exposed on the back. In fine condition. The 'gegenschein' is a faintly bright spot in the night sky around the antisolar point, an optical phenomenon caused by the backscatter of sunlight by interplanetary dust.
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Terms and abbreviations used in our descriptions.