NASA/IPAC Extragalactic Database

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What Wikipedia says

The NASA/IPAC Extragalactic Database (NED) is an online astronomical database for astronomers that collates and cross-correlates astronomical information on extragalactic objects (galaxies, quasars, radio, x-ray and infrared sources, etc.).

Excerpt from the Wikipedia article “NASA/IPAC Extragalactic Database”, under the CC BY-SA 4.0 license. Read the article on Wikipedia