- Advanced Composition Explorer (ACE)
 - Online data, documentation, instruments, news, and more. - Astronomer's Telegram
- Resource for reporting and commenting on new astronomical observations in the astrophysics community.
- Astronomia Nova
- Provides a comprehensive overview of stellar astronomy.
- Astronomical Optical Interferometry
- Provides an historical account of the development of optical interferometry and discussions of the principles involved. Written by an undergraduate for an undergraduate audience.
- Astrophysical Journal, The (2)
- Astrophysics Source Code Library: Archive
- Compilation of codes developed in various areas of astronomy and astrophysics.
- Astroppo
- Features astronomy and astrophysics resources, news, and information.
- CATS Database
- Astrophysical Catalogues support System.
- Chandrasekhar, Subramanyan (1910-1995)@
- Christine's Background Independence
- Thoughts about astrophysics, cosmology, quantum gravity, and many other things.
- Common Astrophysics Acronyms
- Geometrical Physics
- Astrophysicist Jean-Pierre Petit presents his research in physics, cosmology, astronomy and mathematics. In French and English.
- History of High-Energy Astrophysics
- A list of many important dates in the history of high-energy astrophysics and astronomy in general, with links to further details.
- Hubble Constant (2)
- Imagine the Universe!
- Dedicated to discussion about the universe, how it is evolving, and the kinds of objects and phenomena it contains. A service of NASA's High-Energy Astrophysics Learning Centre.
- Logarithmic Maps of the Universe
- Conformal map of the universe illustrating recent discoveries ranging from Kuiper belt objects to the galaxies and quasars from the Sloan Digital Sky Survey.
- NASA Astrophysics Data System
- Abstracts on astrophysics, astronomy, instrumentation, geophysics, and physics. Plus the Los Alamos preprint server, articles, and catalogues.
- Ned Wright's Cosmology Tutorial
- Illustrated introduction to modern observational cosmology and the Big Bang Model. Includes FAQs and cosmological fads and fallacies.
- Nuclear Astrophysics Data
- Origins of Structure in the Universe
- Canadian Astronomy and Astrophysics in the 21st Century.
- Scientific American: Mapping the Universe
- Using techniques drawn from the analysis of music, astronomers have been studying how galaxies form into progressively larger groupings.
- Shapley - Curtis Debate in 1920
- Guide to understanding all facets of the Great Debate between Harlow Shapley and Heber D. Curtis over the scale of the universe. Includes a complete transcript.
- Simbad
- Brings together basic data, cross-identifications, observational measurements, and bibliography, for celestial objects outside the solar system: stars, galaxies, and nonstellar objects within our galaxy, or in external galaxies.
- Space Interferometry Mission (SIM)
- Will be NASA's first space interferometer designed specifically for measuring the position of stars.
- Space Time Mass
- The fabric of space-time is another state of matter and hence it has equivalent mass. The missing mass of the Universe is in the space-time itself that fills the cosmos.
- Spectrashift.com
- Dedicated to amateur redshift measurements. This site gives information on spectroscope construction, software processing, data examples, and more.
- University of Tennessee: Astronomy 162 - Stars, Galaxies, and Cosmology
- Course outline providing information on the nature of light, formation of stars, active galaxies, issues in cosmology, and more.
- WebStars: Astrophysics in Cyberspace
- List of astronomical resource sites created by the High Energy Astrophysics Science Archive Research Centre (HEASARC) at NASA's Goddard Space Flight Centre.
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