NASA/IPAC Extragalactic Database

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The NASA/IPAC Extragalactic Database (NED) is an on-line astronomical database for professional research astronomers that collates and cross-correlates astronomical information on objects (galaxies, quasars, radio, x-ray and infrared sources, etc.) beyond the Milky Way. NED is operated by the Jet Propulsion Laboratory on the campus of the California Institute of Technology, under contract with NASA.

As of 2 October 2007, NED contains 10.1 million distinct astronomical objects with 15.5 million cross-identifications across multiple wavelengths, with redshift measurements for 1.4 million objects, 38.8 million photometric data points, 3.6 million diameter measurements and 2.3 million images, maps and external links, together within links to journal articles, notes and abstracts.

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