The NASA/IPAC Extragalactic Database (NED) is an on-line astronomical database for astronomers that collates and cross-correlates astronomical information on extragalactic objects (galaxies, quasars, radio, x-ray and infrared sources, etc.). NED was created in the lat 1980's by two Pasadena astronomers, George Helou and Barry F. Madore. NED is funded by a NASA and is operated by the Jet Propulsion Laboratory on the campus of the California Institute of Technology, under contract with NASA.
As of June 2012, NED contains 170 million distinct astronomical objects with 182 million cross-identifications across multiple wavelengths, with redshift measurements for 4 million objects, 1.7 billion photometric data points, 8.8 million diameter measurements, 43 thousand redshift-independent distances for over 10 thousand galaxies, 390 thousand detailed classifications for 210 thousand objects, and 2.7 million images, maps and external links, together with links to 58 thousand journal articles, notes and abstracts.
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