See also:

• Science: Astronomy  (3,908)
• Science: Physics: Nuclear  (152)
• Science: Physics: Particle: Astro Particle  (31)
• Science: Physics: Plasma: Space Plasmas  (23)
• Science: Technology: Space  (1,678)

This category in other languages:
	French  (12)   German  (18)   Russian  (3)   Spanish  (4)

• 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
• Astronomy and Astrophysics for all... - you can find every thing you want on this topic in this site...
• The Astrophysical Journal - Devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
• Astrophysics - E-Print archive since April of 1992.
• Astrophysics and Astronomy - Introductory essays on astrophysics and astronomy.
• 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.
• 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.
• Dyson Sphere - A list of frequently asked questions with answers.
• 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.
• 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.
• 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.
• 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 - A well know problem from astrophysics, Olber's paradox (Why is the night sky dark?), solved. As well as Newton's related Gravity paradox.
• 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.
• Solar System - Celestial Mechanics - Presents ideas about the rotation of the sun and planets.
• Space Physics Textbook - A free online textbook on space physics.
• The Structure, Stability, and Dynamics of Self-Gravitating Systems - An interactive Astrophysics textbook from Louisiana State University.
• Temporal Annex - Information mostly on the fourth dimension and theoretical physics.
• 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.
• The Titius-Bode Number Sequence Deciphered - An explanation of the Titius-Bode Law of planetary spacing.
• 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.