Orbiting Junkyard Poses Danger to Space Flight
Scientists worry that the number of junk objects could grow into the billions, threatening active satellites and spacecraft and making space flight increasingly dangerous. They also worry that collisions could create even more space "shrapnel" that simply adds to the risk. The ultimate fear is that, to remain safe, spacecraft will need so much protective shielding as to make them cost-prohibitive.
Source: New York Times