Keck Interferometer
- A ground-based component of NASA's Origins Program that addresses fundamental questions about the formation of galaxies, stars, and planetary systems, the prevalence of planetary systems around other stars, and the formation of life on Earth.
- http://planetquest.jpl.nasa.gov/Keck/keck_index.cfm

Stratospheric Observatory for Infrared Astronomy
- News and updates, education and public outreach, research information, and galleries.
- http://www.sofia.usra.edu/

National Optical Astronomy Observatory
- Information, news, resources, outreach programs, gallery, observing information, software, and newsletter and reports.
- http://www.noao.edu/

McDonald Observatory
- Facility information, equipment and instrumentation, observer information, and research.
- http://www.as.utexas.edu/mcdonald/

Kitt Peak National Observatory
- General information, image gallery, facility schedule, documentation, observation information, documentation, and electronic forms and tools.
- http://www.noao.edu/kpno/

Berkeley Automated Imaging Telescopes
- Information for the Leuschner Berkeley and the Katzman automatic imaging equipment.
- http://astron.berkeley.edu/~bait/

Spitzer Space Telescope
- General information, articles, downloads, equipment information, news, and links.
- http://www.spitzer.caltech.edu/

InfraRed Telescope Facility
- General information, observing information, instrumentation, facility systems, photo gallery, news, and links.
- http://irtfweb.ifa.hawaii.edu/

The Advanced Satellite for Cosmology and Astrophysics
- Mission characteristics, science highlight, and archive.
- http://heasarc.gsfc.nasa.gov/docs/asca/asca.html

Sloan Digital Sky Survey
- A dedicated 2.5 meter telescope which uses sensitive electronic light detectors to systematically map a quarter of the sky, building a catalog of celestial objects, galaxies, and quasars. Data links, questions and answers, image gallery, project tour, ne
- http://www.sdss.org/

Tenagra Observatories
- Operations, commercial time, facilities and equipment information, sites, discoveries, articles, and links.
- http://www.tenagraobservatories.com/

Mount Laguna Observatory
- Facilities, equipment and instrumentation information, virtual tour, site map, CCD camera laboratory and production, and resources.
- http://mintaka.sdsu.edu/

Lowell Observatory
- Research, education and outreach, mission, star tales, and links.
- http://www.lowell.edu/

Cambridge Optical Aperture Synthesis Telescope
- A multi-element optical interferometer with baselines of up to 100 meters, designed to observe stars with angular resolution as high as one thousandth of one arcsecond.
- http://www.mrao.cam.ac.uk/telescopes/coast/

Steward Observatory
- Equipment information, projects, calendar, talks, news, and links.
- http://www.as.arizona.edu/steward/

Carnegie Observatories
- Information for observers, calendar, publications and libraries, seminars and conferences, fellowship program, and links.
- http://www.ociw.edu/

Mount Wilson Observatory
- Projects, outreach and education, history, FAQ, news, and links.
- http://www.mtwilson.edu/

Apache Point Observatory
- Consists of 3.5 meter, 2.5 meter, and 1.0 meter with projects, schedules, observing aids, and information for each.
- http://www.apo.nmsu.edu/