© ESAThis computer simulation depicts
the density of space junk circling the plane
The 'space fence', which is officially known as the US Air Force Space Surveillance System, is going to be shut down on October 1st this year.
The system, which is a multi-station radar, tracks satellites, meteoroids and space debris that is heading our way. The radar stations are scattered across the southern USA and can detect objects some 25,000 miles away from the Earth. The tracking devices form a crucial part of our defenses against all types of space matter likely to cause damage to the planet.
The Congressional sequester imposed automatic budget cuts meaning there just isn't the cash to run the service past October 1st. It's worrying in the extreme that the government thinks it's reasonable to shut down such a critical part of our defense system. As more and more satellites are blasted into orbit from countries around the globe it's not difficult to work out that more and more of them will eventually crash back to Earth.
Comment: Interesting, less than two months ago, another fireball exploded over the same region:
Bright meteor lights up Eastern coast of Australia