ASP"s A Selected List of Web Sites for Instructors of Introductory Astronomy Courses ASP"s A Selected List of Web Sites for Instructors of Introductory Astronomy Courses
| Level 5, A Knowledgebase for Extragalactic Astronomy and Cosmology A service of the NASA/IPAC Extragalactic Database (NED), this is an evolving library of information and commentary about extragalactic objects.
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LIGO Document Control Center (DCC) The LIGO Scientific Collaboration"s central repository for documents, drawings, and other project information.
| NASA/IPAC Extragalactic Database (NED) NED is a multi-wavelength database of extragalactic objects, providing data for millions of objects, including photometry, positions, and redshifts.
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