Solar System Collisions
- Online calculator for effects of asteroid impact.
- http://janus.astro.umd.edu/astro/impact/

Traces of Catastrophe
- Online book. Detailed introduction and overview of impact processes, crater formation, and shock metamorphism.
- http://www.lpi.usra.edu/publications/books/CB-954/CB-954.intro.html

Impact Parameters
- Online calculator for cratering effects of hypothetical asteroid impacts.
- http://www.lpl.arizona.edu/impacteffects/

Impact Structures
- Geology, geophysics, and petrology of impact structures (meteorite impact craters) with special focus on the Azuara and Rubielos de la Cérida impact structures (Spain)
- http://www.impact-structures.com/

Chicxulub Scientific Drilling Program
- Multinational program to obtain and study core samples.
- http://www.icdp-online.de/sites/chicxulub/news/news.html

Terrestrial Impact Craters
- Background information, images, list of craters, references.
- http://www.solarviews.com/eng/tercrate.htm

A 'Smoking Gun' for Dinosaur Extinction
- NASA JPL article on the Chicxulub crater. An image from the Shuttle Radar Topography Mission shows an elevation feature of the crater. The article gives background information and interpretation of the image.
- http://www.jpl.nasa.gov/earth/features/chicxulub.cfm

Crater
- A program that relates crater size to projectile size.
- http://www.lpl.arizona.edu/tekton/crater.html

Astronomy Picture of the Day - Barringer Crater on Earth
- Aerial photograph.
- http://antwrp.gsfc.nasa.gov/apod/ap990711.html

Astronomy Picture of the Day - Manicouagan Impact Crater on Earth
- Image taken from space shuttle Columbia in 1983.
- http://antwrp.gsfc.nasa.gov/apod/ap001213.html

Astronomy Picture of the Day - Impact: 65 Million Years Ago
- Computer rendering of Chicxulub crater, from gravity and magnetic field data.
- http://antwrp.gsfc.nasa.gov/apod/ap000226.html

Why are impact craters always round?
- The answer given in an article from Scientific American.
- http://www.sciam.com/askexpert_question.cfm?articleID=000DBCF7-C08B-1C71-9EB7809EC588F2D7

Impact Craters on Earth
- Map of crater locations in Canada, crater images, explanation and images of rock altered by impact.
- http://miac.uqac.ca/MIAC/impact.htm

Meteor Crater
- Images and short explanations of geologic features near the rim of the Barringer meteor crater.
- http://www.meteorite.com/meteor_crater/

Three Craters in Israel
- Investigates the possibility they have been caused by comet fragments.
- http://www.gsanctuary.com/3craters.html

Terrestrial Impact Cratering and Its Environmental Effects
- World map of impact sites, details on the Chicxulub site, and details on environmental effects of impacts.
- http://www.lpl.arizona.edu/SIC/impact_cratering/intro/