By observing galactic motions and from cosmology we know that there is a mass in the Universe that we cannot observe so far. It is called dark matter, as opposed to bright stars. It could be some kind of elementary particles.
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Homepage of the CRESST experiment (Cryogenic Rare Event Search with Superconducting Thermometers), a European collaboration to search for particle constituents of dark matter in the Gran Sasso laboratories.
Description of dark matter, its properties and consequences. Includes texts, plots, graphs and schematics. By Martin White (University of California, Berkeley).
Dark Matter Mystery
Elementary introduction to dark matter, suitable for a general audience. The pages are part of the public outreach effort of the Chandra X-Ray Observatory, and hosted by Harvard University.
Discussion about Dark Matter
Transcript of an on-air discussion between physicists Michio Kaku and Stuart Samuel on the subject of dark matter. Suitable for a general audience. Aired on WBAI's "Explorations in Science" on December 3, 1997.
The Early History of Dark Matter
Article about the discovery of, and early research on, dark matter by Zwicky, Smith, Babcock and Oort in the 1930's and 1940's. By Sidney van den Bergh (Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada).
Modified Gravity and the Phantom of Dark Matter
J. R. Brownstein's Ph.D. Thesis on the modified gravity alternative explanation to dark matter, and a core-modified dark matter fitting formula.
Particle Dark Matter: Evidence, Candidates and Constraints
Review article on particle dark matter, with a focus on experimental searches. Suitable for graduate students or advanced undergraduates. By Gianfranco Bertone, Dan Hooper and Joseph Silk.
Primer on Dark Matter
Concise illustrated overview of the current status of dark matter. Some basic previous knowledge of astronomy is needed. By Mike Guidry (University of Tennessee, Knoxville).
The Search for Dark Energy and Dark Matter
Video of a talk given by Stanford physicist Patricia Burchat at the 2008 TED conference.
UK Dark Matter Collaboration
Homepage of a UK-based collaboration that, from 1987 to 2007, operated a series of underground detectors in search of weakly interacting massive particles – candidate constituents of dark matter.
What is Dark Matter?
One-page explanation of dark matter from the Usenet Physics FAQ, written by Scott I. Chase.
Homepage of a collaborative experiment that searches for dark matter constituents. Includes information about the experiment, the collaborators in the UK, Portugal, and Russia, and publications.
Found: Most of the Universe
Article by "bad astronomer" Phil Plait on the COSMOS survey that has mapped the distribution of dark matter in the cosmos. Published in Seed magazine. (February 02, 2007)
Is Dark Matter Theory or Fact?
As part of Scientific American's "Ask the Experts" series, physicists Rhett Herman of Radford University and Shane L. Larson of Montana State University give an accessible account of the evidence for dark matter. (June 15, 1998)