Satellites collide for first time-Time to have traffic signals in space

One U.S. communications satellite has collided with one defunct Russian satellite in space, NASA said Wednesday. The first such collision in space, the accident occurred Tuesday nearly 500 miles (805 kilometers) over Siberia, NASA spokesman Kelly Humphries said.

A pair of massive debris clouds was produced after the crash, the spokesman said, adding that the magnitude of the accident was still unknown.