http://en.wikipedia.org/wiki/Spaceguard
http://www.esa.int/Our_Activities/Operations/Space_Debris/Scanning_observing
http://en.wikipedia.org/wiki/United_States_Space_Surveillance_Network - ta zla armada je na nieco dobra;) - hlavne sa zameriavaju na sledovanie ICBM a satelitov, ale popri tom musia overit vsetky podozrive objekty, aby sa predislo falosnemu poplachu a spusteniu obrany.

plus bordel z nefunkcnych/rozbitych satelitov a ich casti k tomu:
In 2011, NASA said 22,000 different objects were being tracked.
Currently more than 13,000 close calls are tracked weekly.