This category is dedicated to sites about black holes - ultra-compact astronomical objects that are predicted by Einstein's theory of general relativity, whose gravity is so strong that not even light can escape.

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Black Hole Images at "Astronomy Picture of the Day" (APOD)
From NASA's "Astronomy Picture of the Day" archive, the three most educational images (editor's choice) related to black holes.
Black Holes
Pages by the relativity group at Cambridge University, aimed at a general audience. They include a brief introduction to black holes, information about observational evidence, and a section on black holes and critical phenomena.
Black Holes & Co.
Collection of articles about various aspects of black hole physics, from astronomical observations to the question of why black holes have no hair. Part of the "Spotlights on Relativity" series on Einstein Online; written for a general audience.
Black Holes and Beyond
Part of the "Spacetime Wrinkles" exhibit published by the National Center for Supercomputing Applications: descriptions of what black holes are, how they might be detected, and what kinds of gravitational waves they should produce. Aimed at a general audience.
Frequently Asked Questions about Black Holes
FAQ for the usenet newsgroup sci.physics; compiled by Matt McIrvin; last change 1995. Suitable for a general audience; addresses a number of fundamental questions such as "How does gravity get out of a black hole" or "What happens if you fall in".
Gravity's Relentless Pull
Information about black holes for a general audience, including virtual journeys and simulations, from the Space Telescope Science Institute (the people in charge of the Hubble Space Telescope).
Jillian's Guide to Black Holes
An informal introduction to the different types of black holes, to what happens outside and inside such objects, and to how they can be detected; suitable for a general audience. Created by Jillian Bornak as the final project for a beginners' course on general relativity at Syracuse University in 2003.
Resources Dealing with Black Holes, Singularities, and Event Horizons
List of articles, websites, and images on, compiled by Nick Greene.
ScienceDaily: Black Hole News
List of news articles and press releases related to all aspects of black hole physics, from theory to astronomical observations; updated frequently.
Developments in General Relativity: Black Hole Singularity and Beyond
Article by Igor D. Novikov (University of Copenhagen) on current theories about the inside of black holes, addressing questions such as "Can we see inside a black hole?" and "Can a falling observer cross the singularity without being crushed?" (April 14, 2003)
Black Holes
A one-hour lecture given by David M. Harrison (University of Toronto) to senior liberal arts students on the basic properties of black holes. (June 02, 2002)
Black Holes
Review article by Piotr Chrusciel (Universit├ę de Tours), covering the evidence for the existence of black holes, their mathematical definition, global aspects, and the most important black hole theorems. Special care is taken in exploring aspects relating to numerical simulations of black hole systems. (January 16, 2002)
Black Holes and String Theory
Review by Rob Myers (Perimeter Institute); includes information about calculations of the black hole entropy using branes. Based on lectures given at the 4th Mexican School on Gravitation and Mathematical Physics. (July 10, 2001)
Black Holes
Review article by Gary T. Horowitz (UCSB) and Saul A. Teukolsky (Cornell); includes information on the observational evidence for black holes, some developments involving cosmic censorship, and the statistical origin of black hole entropy. (August 12, 1998)
Black Holes and Naked Singularities
Review article by T. P. Singh (Tata Institute) about gravitational collapse and the cosmic censorship hypothesis; includes a summary description of known models of collapse resulting in the formation of black holes and naked singularities. (May 18, 1998)
Black Holes: A General Introduction
Review article by Jean-Pierre Luminet (Observatoire Paris-Meudon), which presents in a pictorial way the basic concepts of black hole physics; includes information about astronomical objects that are black hole candidates. (January 26, 1998)
Black Holes
Lecture notes for Paul K. Townsend's course on Black holes at Cambridge University. Covers the basics of black hole physics, the mechanics of black holes, and related geometrical concepts at a level suitable for advanced physics students. (July 04, 1997)

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