Experts from the Canadian Space Agency and Nasa found the puncture during a routine inspection of Canadarm2. The arm performs station maintenance, moves supplies – and even astronauts – and performs “cosmic catches” by grappling visiting crafts and bringing them to the ISS.
The inspection, which took place on 12 May, found that the puncture came from a piece of space debris that was too small to be tracked – which accounts for rock or dust particles to flecks of paint from satellites, the CSA says. Any object the size of a football or larger can be tracked.
“Despite the impact, results of the ongoing analysis indicate that the arm's performance remains unaffected. The damage is limited to a small section of the arm boom and thermal blanket”, the space agency said.
“Canadarm2 is continuing to conduct its planned operations, including hoisting Dextre [a repair robot] into position to replace a faulty power switchbox”.
The issue of space debris has been long-running, and is only going to become a larger issue as humanity sends more crafts into orbit.
There are currently around 200,000 objects between 0.4 and 4 inches, and tens of thousands of objects larger than 4 inches, floating in space according to the United States Space Surveillance Network – but that could be a conservative estimate.
A study presented last month at the European conference on space debris says that the problem has been underestimated, and that the amount of space junk in orbit could, in a worst case scenario, increase 50 times by 2100.
Should two pieces of space debris collide, the result could be a domino effect that could keep humans trapped on Earth.
In order to alleviate this problem, the UK has led the launch of two spacecraft to collect the debris using a magnetic docking system.