When worlds collide...

Terrestrial Impact Craters
Answers to frequently asked questions concerning potential asteroid and comet impacts
The Planetary Society's Near-Earth Objects Homepage
JPL's Near-Earth Objects Homepage
 Meteors, Meteorites, and Impacts
The American Meteor Society
A table of current impact risks for some Near Earth Asteroids
A table of near-Earth encounter dates with potentially hazardous asteroids
Forthcoming Close Approaches To The Earth
Close Approaches To The Earth (1900-2178)
1908 SIBERIA EXPLOSION: Reconstructing an Asteroid Impact from Eyewitness Accounts
Here and here are two more discussions of the Tunguska `impact' of 1908

Asteroid and Comet Impact Hazards
Asteroid Radar Research
SOLAR SYSTEM COLLISIONS: a simple destruction calculator
Earth Impact Effects Program: plug in the impactor, and program gives detailed accounts of the resulting destruction

Another website that makes detailed predictions of impact craters, including dimensions, lip, ejecta, melt, and much more. This one is all set up for lunar impacts. And this one is pretty darned cool, too.

Impact Earth! A way cool simulator from Purdue University and Imperial College London.

Finding & tracking the dangerous ones: Near Earth Asteroid Tracking
Asteroid and Comet Impact Hazards
Canadian Meteorite and Impacts Advisory Committee

The Barringer Crater Homepage
Gary Ferland's page on those objects that occasionally hit the Earth...
Supercomputer simulations of a comet or meteor impacting the Earth off Long Island; link to the animation of simulation
The American Meteor Society - a good list of FAQs on fireballs and falling meteors

Links to Organizations and network resources on Near Earth Asteroids
SpaceWatch Project at LPL, University of Arizona
A daily updated map of known asteroids and comets in the inner solar system, and some gif animations of their motions

GIF file animation courtesy of JPL/NEA.  Note: the distances to sufficiently large asteroids can also be determined via the reflection of radio waves (radar ranging).

Last Updated on 4 January 2011
By Kirk Korista
Professor of Astronomy
Department of Physics
Western Michigan University