Astronomical Data Center
http://nssdc.gsfc.nasa.gov/adc/adc.html
Element of the National Space Science Data Center (NSSDC) / A World Data Center for Rockets and Satellites (WDC-A-R&S). Part of an international federation of astronomical data centers. Acquires, verifies, formats, documents, and distributes files that contain astronomical data in computer-readable form. Also develops and maintains software tools to access these data.
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