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Osservatorio Astronomico di Bologna (Popularity: ): Information, activities, services, publications, equipment information, and library.
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Lick Observatory (Popularity: ): Facility schedule, calendar, resources, equipment and instrument information, available filters, printable log sheets, and bulletins.
Hubble Project (Popularity: ): Overview, operations, technology, servicing missions, project, news, and image gallery.
Hubble (Popularity: ): General information, images, mission, news, latest report, announcements, and special features.