Overview of the basic ideas and principal applications of general relativity. Written by John L. Safko for students in the self-paced astronomy courses at the University of South Carolina in 1997.

The Physics FAQ's guide to relativity books; by Chris Hillman (with contributions by Nathan Urban). An extensive annotated list of semi-popular books, textbooks and background reading.

Description of NASA's Beyond Einstein missions set to explore various consequences of general relativity - and possibly, as the name indicate, go beyond what Einstein's theory predicts. Includes educational resources.

Various pages with non-technical texts about cosmology, black holes, cosmic strings, inflation, quantum cosmology, and string theory, written by members of the Relativity Group at Cambridge University.

Information about Einstein's theories of special and general relativity and their applications; site is hosted by the Max Planck Institute for Gravitational Physics. Includes a simple introduction, a collection of articles ('Spotlights on relativity'), and a relativistic dictionary.

Attempt at a content aimed at the Internet community to write a simulation program, based on a simple algorithm incorporating the laws of general relativity, that can realistically simulate the behavior of black holes, binary stars, and the twin paradox. (December 28, 2005)

An introduction by Jan-Willem van Holten (NIKHEF, Amsterdam), based on lectures given at the University of Heidelberg in 1997. (April 15, 1997)

Try an experiment that illustrates the gravitational attraction between two objects or use a Java applet to understand how orbits work in strongly curved space-time.

Interactive database developed by Mustapha Ishak and Kayll Lake and hosted by Queen's University; allows the user to search for specific solutions of Einstein's field equations (that is, for specific model universes of general relativity).

By Gerard 't Hooft (Utrecht University); based on lectures held in 2002; a thorough introduction starting with accelerated frames and including topics such as black holes, the basics of cosmology, and gravitational radiation.

Profile of Albert Einstein, with additional teaching resources, Shockwave demonstrations, and animations of relativity concepts.

Review article by Luis Lehner about the foundations of numerical relativity and recent progress in the field; particular attention is paid to simulations of black hole spacetimes. (February 19, 2002)

A collection of articles about relativity

A set of hypertext based services for general relativity research provided by the QMW Relativity group.

Provides information on the history, experiments and paradoxes of relativity.

Large collection of relativity-related links by Rob Salgado (Syracuse University). Warning: page hasn't been updated since 2000, and quite a number of links are now broken.

Science popularization article on the Theory of Relativity.

Page scans from the Handbook of Space Astronomy and Astrophysics giving equations and formulas for special relativity and relativistic cosmology. Includes bibliography.

Extensive list of classic and modern research papers in cosmology and general relativity. Although the author warns that his selection is subjective, the result is a highly useful list of references; for many papers, there are links to online versions on the arXiv.org e-print server. By Henk van Elst (Queen Mary, University of London).

A brief summary of Spacetime Theories at the beginning of the Third Millennium, and of the possibility that we live in an essentially atemporal universe.

Review of the motivations for and basic principles of general relativity, aimed at a general audience. Written by Naresh Dadhich (IUCAA Pune), based on a lecture delivered in 2001. (February 3, 2001)

Introduces the basic principles of relativity, the physics of special relativity, and some basic principles of general relativity. Contains a great number of helpful images and animations; site created by Rob Salgado (Syracuse University).

Annotated list of reading material about general relativity: popular books, textbooks, books on specific topics, web courses, and websites.

Encyclopedia article explaining the basic concepts, observational tests and (astrophysical) applications of general relativity.