Impacts Into Asteroids Erik Asphaug's simulations of asteroid disruption; natural collisions in the asteroid belt, and human endeavors to disrupt or deflect a collision.
http://www.es.ucsc.edu/~asphaug/ (Added: 12/26/00))
International Comet Quarterly This is a key place to begin looking for useful and accurate information regarding news, observations, orbital data, designations and names, and good links regarding comets and related topics.
http://cfa-www.harvard.edu/icq/icq.html (Added: 12/27/00))