US Air Force building radar 'space fence' that will keep American satellites safe

The US Air Force is working on a'space fence' to protect spacecraft from orbiting junk. It plans to activate it in just under two years to replace a similar system that was shut down in 2013. While the military has dubbed the system a'fence', it is in fact a radar system that sends signal into space to track objects the size of a tennis ball. The US Air Force is working on a'space fence' to protect spacecraft from orbiting junk. It plans to activate it in just under two years to replace a similar system that was shut down in 2013.