Astrophysics

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

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

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

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/

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

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/

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

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

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

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

Olber's Paradox - 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://www.ronaldkoster.net/olber.html

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

Interdisciplinary Astrophysics Group - 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://altamira.asu.cas.cz/

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/

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

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/

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

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

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/

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

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

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

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

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

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

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

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

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

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

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/

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

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

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

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

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