» ADAF Theory
   Accretion disk theory, mixing-length theory of convection, advection-dominated accretion flows.
   http://astrosun.tn.cornell.edu/us-rus/adaf.htm

» 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.
   http://adc.gsfc.nasa.gov/amase/

» 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
   http://hea-www.harvard.edu/~efortin/thesis/html/index.shtml

» Astronomy and Astrophysics for all...
   you can find every thing you want on this topic in this site...
   http://www.geocities.com/astrosci4u/

» Astrophysics
   E-Print archive since April of 1992.
   http://www.arxiv.org/archive/astro-ph

» Astrophysics and Astronomy
   Introductory essays on astrophysics and astronomy.
   http://www.hpwt.de/Astroe.htm

» Cambridge Relativity
   Beginner's guide to all the basic concepts of Astrophysics written by active scientists at Cambridge University, UK.
   http://www.damtp.cam.ac.uk/user/gr/public/

» Canadian Institute for Theoretical Astrophysics
   Nationally supported research centre. Find out about current research, upcoming seminars and job opportunities.
   http://www.cita.utoronto.ca

» 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.
   http://www.geocities.com/isoptera.geo/index.html

» Contents
   Accretion in astrophysics - active galactic nuclei, processes and dynamics.
   http://astron.berkeley.edu/~jrg/ay202/node1.html

» Dyson Sphere
   A list of frequently asked questions with answers.
   http://www.nada.kth.se/~asa/dysonFAQ.html

» 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.
   http://eaa.iop.org/

» Famous Astrophysicists
   Profiles several prominent astrophysicists.
   http://www.famous-astrophysicists.com

» Fermilab Theoretical Astrophysics Group
   Partially funded by a NASA Astrophysics Theory grant, find information about the group's past and future meetings.
   http://www-astro-theory.fnal.gov

» 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.
   http://www.ipam.ucla.edu/programs/pca2005/

» 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.
   http://www.hartford-hwp.com/archives/20/035.html

» Hands-On Astrophysics
   Offers educational products that help students understand basic astronomy concepts.
   http://hoa.aavso.org

» Hyperspace
   Site devoted to hyperspatial theories.
   http://artling.tripod.com

» Interdisciplinary Astrophysics Group
   
   http://altamira.asu.cas.cz/

» 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.
   http://solarphysics.livingreviews.org

» Modified Newtonian Dynamics
   Overview of a controversial theory which is not generally accepted by the astrophysical community.
   http://ca.geocities.com/mercy@rogers.com/

» NASA Astrophysics Data System
   Search system for abstracts in astrophysics, planetary sciences and solar physics.
   http://adsabs.harvard.edu/

» Network Generator
   Generates astrophysical reaction rates online using an extended database.
   http://www-astro.ulb.ac.be/Netgen/form.html

» Nuclear Astrophysics Data
   An area for providing nuclear data for astrophysics calculations, such as nucleosynthesis, stellar evolution, the Big Bang, and super-nova dynamics.
   http://t2.lanl.gov/data/astro/astro.html

» 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.
   http://home.wanadoo.nl/ronald.koster/olber.html

» Physics 208 - Introduction to Astrophysics
   Course offered via The Electronic University, an educational outreach server at the University of Oregon.
   http://zebu.uoregon.edu/~imamura/astro.208.html

» Physics Topics - Teaching Notes
   Teaching notes on celestial mechanics, classical mechanics, and stellar atmospheres.
   http://orca.phys.uvic.ca/~tatum/

» Red Shift by Photon Decay
   Author explains how Hubble's red shift of starlight spectra results from photon decay, proportional to traveled distance.
   http://members.chello.nl/~n.benschop

» 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.
   http://simbad.u-strasbg.fr/Simbad

» Solar System - Celestial Mechanics
   Presents ideas about the rotation of the sun and planets.
   http://www.surf2000.de/user/f-heeke/index.html

» Space Physics Textbook
   A free online textbook on space physics.
   http://www.oulu.fi/~spaceweb/textbook/

» 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).
   http://www.ph1.uni-koeln.de/workgroups/astro_instrumentation/this/

» Temporal Annex
   Information mostly on the fourth dimension and theoretical physics.
   http://temporal_science.tripod.com/

» The Astrophysical Journal
   Devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
   http://www.journals.uchicago.edu/ApJ/

» 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.
   http://www.astrophysicsspectator.com/

» 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.
   http://www.the-electric-universe.info/

» 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.
   http://adswww.harvard.edu/

» The Structure, Stability, and Dynamics of Self-Gravitating Systems
   An interactive Astrophysics textbook from Louisiana State University.
   http://www.phys.lsu.edu/astro/H_Book.current/H_Book.shtml

» The Titius-Bode Number Sequence Deciphered
   An explanation of the Titius-Bode Law of planetary spacing.
   http://users.telenet.be/TaoWeb/TitiusBode.htm

» Titius-Bode Law
   Overview of the Titius-Bode Law.
   http://milan.milanovic.org/math/english/titius/titius.html

» 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.
   http://www.ph.surrey.ac.uk/astrophysics/index.html

» You Be the Astrophysicist
   Interactive site for learning about astronomy and astrophysics.
   http://imagine.gsfc.nasa.gov/YBA/yba-intro.html