| Above the Skies, An Exploration into Our Universe Through Animated Spectroscopy: A description at the layman level about the applications of spectroscopy in the investigation of the Solar System, with interactive diagrams |
| ADAF Theory: Accretion disk theory, mixing-length theory of convection, advection-dominated accretion flows. |
| AMASE - Astrophysics Multi-spectral Archive Search Engine: An online astrophysics catalog developed using object-oriented database technology to help researchers locate multi-mission data in the NASA archives. |
| Astronomy and Astrophysics for all...: you can find every thing you want on this topic in this site... |
| Astrophysics: E-Print archive since April of 1992. |
| Astrophysics and Astronomy: Introductory essays on astrophysics and astronomy. |
| Cambridge Relativity: Beginner's guide to all the basic concepts of Astrophysics written by active scientists at Cambridge University, UK. |
| Canadian Institute for Theoretical Astrophysics: Nationally supported research centre. Find out about current research, upcoming seminars and job opportunities. |
| Cause of the Characteristics of Quasars: Hypothesis which attempts to explain the characteristics of QSOs (Quasi-Steller Objects), a.k.a. quasars, as optical illusions created by gravitational lensing and other phenomena. |
| Contents: Accretion in astrophysics - active galactic nuclei, processes and dynamics. |
| Dyson Sphere: A list of frequently asked questions with answers. |
| Encyclopedia of Astronomy and Astrophysics: Comprehensive archive of explantory articles on all key Astrophysics topics, categorised and fully searchable; actively updated by the Institute of Physics. |
| Famous Astrophysicists: Profiles several prominent astrophysicists. |
| Fermilab Theoretical Astrophysics Group: Partially funded by a NASA Astrophysics Theory grant, find information about the group's past and future meetings. |
| Grand Challenge Problems in Computational Astrophysics: Research session at the Institute for Pure and Applied Mathematics (IPAM), Los Angeles, CA, USA; 7 March - 10 June 2005. |
| Gravity is Cool, or, Why our Universe is Hospitable to Life: Text of the 1999 Oppenheimer lecture at UC Berkeley given by professor Freeman Dyson on the origin of life and other subjects. |
| Hands-On Astrophysics: Offers educational products that help students understand basic astronomy concepts. |
| Hyperspace: Site devoted to hyperspatial theories. |
| Interdisciplinary Astrophysics Group: |
| Living Reviews in Solar Physics: A peer-refereed, solely online journal publishing invited reviews covering all areas of solar and heliospheric physics research. Published by the Max Planck Institute for Aeronomy, Katlenburg-Lindau, Germany. |
| Modified Newtonian Dynamics: Overview of a controversial theory which is not generally accepted by the astrophysical community. |
| NASA Astrophysics Data System: Search system for abstracts in astrophysics, planetary sciences and solar physics. |
| Network Generator: Generates astrophysical reaction rates online using an extended database. |
| Nuclear Astrophysics Data: An area for providing nuclear data for astrophysics calculations, such as nucleosynthesis, stellar evolution, the Big Bang, and super-nova dynamics. |
| Olber's Paradox Solved: A well know problem from astrophysics, Olber's paradox (Why is the night sky dark?), solved. As well as Newton's related Gravity paradox. |
| Physics 208 - Introduction to Astrophysics: Course offered via The Electronic University, an educational outreach server at the University of Oregon. |
| Physics Topics - Teaching Notes: Teaching notes on celestial mechanics, classical mechanics, and stellar atmospheres. |
| Red Shift by Photon Decay: Author explains how Hubble's red shift of starlight spectra results from photon decay, proportional to traveled distance. |
| SIMBAD Astronomical Database: The SIMBAD astronomical database provides basic data, cross-identifications and bibliography for astronomical objects outside the solar system. SIMBAD can be queried by object name, coordinates, other criteria (filters), and lists of objects. |
| Smithsonian Astrophysical Observatory: A research institute of the Smithsonian Institution headquartered in Cambridge, MA, where it is joined with the Harvard College Observatory (HCO) to form the Harvard-Smithsonian Center for Astrophysics (CfA). |
| Solar System - Celestial Mechanics: Presents ideas about the rotation of the sun and planets. |
| Space Physics Textbook: A free online textbook on space physics. |
| Temporal Annex: Information mostly on the fourth dimension and theoretical physics. |
| The Astrophysical Journal: Devoted to recent developments, discoveries, and theories in astronomy and astrophysics. |
| The Astrophysics Spectator: Articles published on this site cover current research in astronomy and astrophysics, describe our current understanding of astronomical phenomena, and comment on issues related to astronomical research. |
| The Electric Universe: Physics knows four forces; 20th-century scientists were convinced that one of those, the electric force, played no macroscopic role in the Universe; site explains why that is incorrect. |
| The NASA Astrophysics Data System: The Astrophysics Data System (ADS) is a NASA-funded project which maintains four bibliographic databases containing more than 4.0 million records: Astronomy and Astrophysics, Instrumentation, Physics and Geophysics, and preprints in Astronomy. |
| The Structure, Stability, and Dynamics of Self-Gravitating Systems: An interactive Astrophysics textbook from Louisiana State University. |
| The Titius-Bode Number Sequence Deciphered: An explanation of the Titius-Bode Law of planetary spacing. |
| THIS-Tuneable Heterodyne Infrared Spectrometer: THIS - instrument pages for the Tuneable Heterodyne Infrared Spectrometer developed by the University of Cologne. THIS is a transportable receiver designed for atmospheric and astrophysical observations in the mid infrared spectral region (7-28 µm). |
| Titius-Bode Law: Overview of the Titius-Bode Law. |
| University of Surrey - Department of Physics (Research): University of Surrey abridged version of the book "Astrophysics" , with many links to relevant material on astronomy, astrophysics and cosmology. |
| You Be the Astrophysicist: Interactive site for learning about astronomy and astrophysics. |
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