Category
page 1Planetary defense organizations
B612 Foundation
nonprofit organization
Spaceguard
thumb|300px|Plot of orbits of known potentially hazardous asteroids (size over and passing within of Earth's orbit) as of early 2013 (alternative image).
Planetary Defense Coordination Office
NASA department for avoiding asteroid impacts
Japan Spaceguard Association
company
Meteoritical Society
learned society
The Spaceguard Foundation
private organization studying outer-space objects to protect the Earth from possible collision