Much has been made of the cybertensions between the US and China, especially when it comes to military secrets. While any conflict thus far has been minor, the latest allegation of China hacking American satellites validates those concerns at least a little.
Launching satellites is a risky proposition–costing as much as $US10,000 a pound to make orbit and little recourse if a critical piece malfunctions. So, DARPA has devised a system to recycle the $US300 billion worth of orbiting dead satellites into a zombie antenna array.