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ESO - European Southern Observatory (Popularity: ): ESO is an intergovernmental, European organisation for astronomical research, operates astronomical observatories in Chile and has its headquarters in Garching, near Munich, Germany.
National Optical Astronomy Observatories (NOAO) (Popularity: ): A national center for optical sky observations, which is operated by the Association of Universities for Research in Astronomy.
Klet Observatory (Popularity: ): Find a complete set of information about the research program at the observatory.
Associated Universities, Inc. (Popularity: ): Manages several astronomical observatories for universities and for the National Science Foundation. Press releases and information about the observatories.
SkyView (Popularity: ): The Internet Virtual Telescope generating images of any part of the sky at wavelengths in all regimes from Radio to Gamma-Ray.
Osservatorio Astronomico di Bologna (Popularity: ): Information, activities, services, publications, equipment information, and library.
Carter Observatory (Popularity: ): General information, education, news, images, schedule, shows, and calendar of events.
The Grove Creek Observatory (Popularity: ): Tour information, astrophotographs, equipment information, images, moon chart, ccd imaging tips, and links.
Observatoire de Haute-Provence (Popularity: ): Observing proposals, publications, photo gallery, instrument information, user's guide, and news.
Lick Observatory (Popularity: ): Facility schedule, calendar, resources, equipment and instrument information, available filters, printable log sheets, and bulletins.
Laser Interferometer Space Antenna -- LISA (Popularity: ): Universität Hannover site. Includes information about the project as well as the text of reports based on it.
Washington University Gravity Group (Popularity: ): WUGRAV, contains large collection of gravity links.