Asteroids and Comets
Basic information about near Earth asteroids and the hazard they pose to Earth. Asteroid origins, potentially hazardous asteroids, Earth crossing asteroids, Torino impact scale.
AstroGuard
News and information about advance warning of asteroid or cometary impacts.
Dynamics of Small Bodies
Offers essays by a university teacher on near Earth object with unusual orbits, such as 3753 Cruithne, 2002 AA29, hypothetical Earth trojans and quasi-satellites.
Earth Satellites for Asteroid Hunters
Data and software useful for identifying artificial satellites which might be mistaken for unknown near-Earth asteroids.
FMO Project
A public program offered by the University of Arizona's Spacewatch Project. Volunteers review images to help find NEOs that the computers miss.
IAU / Near Earth Objects
Summary of research on near Earth objects, activities of the International Astronomical Union's Working Group on Near Earth Objects (WGNEO).
JPL Near-Earth Object Program
NASA NEO Program Office at JPL. Overview, press releases, FAQ, 3D orbit viewer. Research information and statistics, including risk calculations for possible collisions with Ea…
Understanding the Distribution of Near Earth Objects.
Technical paper describing sources and orbital evolution of near Earth objects, and implications for NEO search efforts.
Wikipedia: Near-Earth object
Encyclopedia article covers collision danger, spacecraft access, efforts to catalog NEOs, classifications, impact hazard scales.