== External links ==* Sativew - Tracking Space Junk in real time* NASA Orbital Debris Program Office* ESA Space Debris Office* "Space: the final junkyard", documentary film* Would a Saturn-like ring system around planet Earth remain stable?
* Donald Kessler (Kessler 2009), "The Kessler Syndrome" "webpages.charter.net", 8 March 2009.