An Essay on General Relativity
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.
Are There Any Good Books on Relativity Theory?
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.
Cambridge Relativity Public Home Page
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&
General Relativity Simulation Contest
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.
Interactive Experiments in Gravity
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 Geometric Database
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).
Introduction to 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.
NOVA Online/Einstein Revealed
Profile of Albert Einstein, with additional teaching resources, Shockwave demonstrations, and animations of relativity concepts.
Numerical Relativity: Status and Prospects
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.
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.
Relativity: List of Important Equations
Page scans from the Handbook of Space Astronomy and Astrophysics giving equations and formulas for special relativity and relativistic cosmology. Includes bibliography.
Selected References in Relativistic Cosmology and General Relativity
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
Subtle is the Gravity
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.
The Light Cone: An Illuminating Introduction to Relativity
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).
Wikipedia: General Relativity Resources
Annotated list of reading material about general relativity: popular books, textbooks, books on specific topics, web courses, and websites.
Wikipedia: Introduction to General Relativity
Encyclopedia article explaining the basic concepts, observational tests and (astrophysical) applications of general relativity.