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.

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.

Network Generator - Generates astrophysical reaction rates online using an extended database.

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.

Astrophysics - E-Print archive since April of 1992.

NASA Astrophysics Data System - Search system for abstracts in astrophysics, planetary sciences and solar physics.

WWW Virtual Library - Astronomy and Astrophysics - Provides links to online information about astronomy and astrophysics.

The Structure, Stability, and Dynamics of Self-Gravitating Systems - An interactive Astrophysics textbook from Louisiana State University.

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.

Astrophysics and astronomy - An introduction into astrophysics and astronomy.

Space Physics Textbook - A free online textbook on space physics.

Temporal Annex - Information mostly on the fourth dimension and theoretical physics.

On the Formation of Planetary Rings - Paper presented in 1996 by L. A. Molnar and D. E. Dunn.

Physics 208 - Introduction to Astrophysics - Course offered via The Electronic University, an educational outreach server at the University of Oregon.

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.

Solar System - Celestial Mechanics - Presents ideas about the rotation of the sun and planets.

You Be the Astrophysicist - Interactive site for learning about astronomy and astrophysics.

Hyperspace - Site devoted to hyperspatial theories.

Cambridge X-Ray Astronomy Group - Overview of the techniques and objects in X-ray astronomy.

The Titius-Bode Number Sequence Deciphered - Explanation of the Titius-Bode Law of planetary spacing.

Nuclear Astrophysics Data - An area for providing nuclear data for astrophysics calculations, such as nucleosynthesis, stellar evolution, the Big Bang, and super-nova dynamics.