- Black Holes - Black hole page from NASA's "Imagine the universe!" site; includes a section on observational aspects - "If We Can't See Them, How Do We Know They're There?"
- Do Black Holes Exist? - Brief text by Pablo G. Ostrov about the evidence for the existence of black holes, aimed at a general audience.
- Field Guide to X-ray Sources - Pages on the website of the Chandra X-Ray Observatory; includes information about stellar, mid-mass and supermassive black holes, Chandra images, and a podcast.
- XMM: Black Holes and Quasars - Educational pages on the website of the space-borne X-ray telescope XMM, hosted by the University of Birmingham. Information about black holes and other astronomical sources of X-rays.
Media publications
- Astrophysical Evidence for the Existence of Black Holes - Review article by Annalisa Celotti, John C. Miller, and Dennis W. Sciama (SISSA, Trieste) about the current state of the search for observational evidence for the existence of both stellar-mass and supermassive black holes. (Published 1999-12-09 00:00:00)
- Black Holes in Astrophysics - Review article by Ramesh Narayan (Harvard-Smithsonian Center for Astrophysics) about the astrophysical evidence for black holes. (Published 2005-06-14 00:00:00)
- Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way - Article by R. Schodel and colleagues (Max Planck Institute for Extraterrestrial Physics) about the best evidence to date for the existence of a supermassive black hole in the center of our own galaxy - the way it influences the orbits of nearby stars. (Published 2002-10-18 00:00:00)
- Detection of Hard X-ray Emission from the Galactic Nuclear Region with INTEGRAL - Article by Guillaume Belanger and colleagues; recounts X-ray observations of the neighborhood of our galaxy's central black hole. (Published 2003-11-07 00:00:00)
- Evidence for the Black Hole Event Horizon - Review article by Ramesh Narayan about possible observational evidence for the defining feature of black holes. (Published 2003-10-23 00:00:00)
- Hubble Space Telescope Discovers Disk Fueling Possible Black Hole - News item published on the website of the Space Telescope Science Institute. (Published 1992-11-19 00:00:00)
- Radio Astronomers Lift 'Fog' on Milky Way's Dark Heart - Press release by the National Radio Astronomy Observatory about observations of the immediate neighborhood of our galaxy's central supermassive black hole. (Published 2004-04-01 00:00:00)
- Study of Accretion Processes on Black Holes: Fifty Years of Developments - Review article by Sandip K. Chakrabarti of the research done on one of the main mechanisms by which black holes cause highly luminous phenomena in their immediate neighborhood. (Published 2004-02-24 00:00:00)
- The Afterglow of Massive Black Hole Coalescence - Article by Milos Milosavljevic and Stearl Phinney; describes the kind of afterglow that should be visible for X-ray telescopes when two massive black holes merge. (Published 2005-03-14 00:00:00)