Society for Science and the Public
Science News for Students: What Killed the Dinosaurs?
Researchers are beginning to find data implicating that an asteroid impact and supervolcanoes might have been the beginning of the end of dinosaurs on Earth.
Other
University of Bristol: The Kt Event
This dinosaur site, containing eight different sections, includes topics such as: 101 crazy theories about dinosaur extinction, the pattern and timing of extinction, evidence for late cretaceous climatic change, gradual extinction and...
Virginia Tech
Virginia Polytechnic Institute: Greenhouse Dinosaur Extinction Theory
This comprehensive page discusses the Asteroid Impact vs. Volcano-Greenhouse dinosaur extinction debate. It was written by paleontologist, professor, and scientist Dr. Dewey McLean.
Australian Broadcasting Corporation
Australian Broadcasting Corporation: News in Science: Piece of Dinosaur Extinction Asteroid Puzzle Recovered
The first meteorite fossil discovered in this period when tests can be run on it, was found at Chicxulub in Northeastern Yucatan, Mexico. Scientists believe it is part of the meteorite which made the dinosaurs extinct.
Other
Scientists Say Star Collision Caused Dinosaur Extinction
"Israeli scientists have a new theory on why the dinosaurs became extinct: cosmic radiation that bombarded the Earth following the collision of two neutron stars." This article discusses the details of the theory.