Sloan Sky Survey Focal Plane Plug Plate

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This aluminum "plug plate" is typical of those used at the focal plane of the Sloan Survey telescope at the Apache Point Observatory in New Mexico.  This wide-field reflecting telescope has been cataloging hundreds of millions of celestial objects in the visible sky and has also been recording millions of spectra of galaxies.




Mark Avino


National Air and Space Museum Libraries


Smithsonian Institution

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