Australian laser system to track space junk

Electric Optic Systems said lasers fired from the ground would locate and track debris as small as 10 centimetres (four inches) across, protecting astronauts and satellites.

"We can track them to very high precision so that we can predict whether there are going to be collisions with other objects or not," Craig Smith, the company's CEO, told AFP.

Smith said the technology improved upon existing radar systems because it could detect tiny objects, left behind by disused rockets and satellites, which can still devastate hardware because they are travelling at ultra-high speeds.

He said there were an estimated 200,000 objects measuring less than one centimetre floating in orbit, with another 500,000 of a centimetre or larger.

"It ranges from bus-size bits of rocket bodies all the way down to a little half-a-millimetre fleck of paint," Smith said from the company's headquarters in Canberra.

"The trouble is that they're all travelling at about 30,000 kilometres (19,000 miles) an hour. So unless you're in the same orbit you have hyper-velocity impacts, which can be devastating to a satellite."