SpaceRef - Astronomy - Asteroids And Comets

SpaceRef - Astronomy - Asteroids And Comets - Impact Events and Risks

Asteroid Comet Impact Hazards - This site contains information on various asteroid impact studies carried out at NASA Ames Research Center plus links to a number of other activites around the world.

Japan Spaceguard Association - This is the home page of the Japanese chapter of Spaceguard. Spaceguard is an association aimed at the protection of the Earth environment against the bombardment of objects of the solar system (comets and asteroids).

Spaceguard Canada - Spaceguard Canada is a member of the International Spaceguard Foundation and is funded in part by the Foundation for the International non-Governmental Development of Space.

Spaceguard Foundation - The Spaceguard Foundation is an association aimed at the protection of the Earth environment against the bombardment of objects of the solar system (comets and asteroids).

The Space Shield Foundation (SSF) - The Space Shield Foundation was established in 1994 to promote, support and provide scientific research and technology development on hazards due to space objects (asteroids and comets) impact with the Earth and protection of the planet against such impacts.

The Watch at Space Fontier Foundation - The Watch has started with a donation to the University of Victoria in Canada to further the cause of asteroid observation, follow-up and characterization. These moneys and others have been contributed by philanthropists and businessmen, all of whom recognize the ramifications of neglecting this serious issue.