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The International Space Station sprung a leak yesterday — and it shows why a space junk disaster could cut off human access to space

The International Space Station (ISS) sprung a “minute pressure leak” on Wednesday, NASA said.

The astronauts on board have since found and fixed the source of the leak: a hole about 2 millimeters wide in the Soyuz spacecraft attached to the Russian part of the space station.

NASA said in a press release that the six-person crew were never in danger, and that the cabin pressure is now holding steady.

“Flight controllers in Houston are continuing to monitor station’s cabin pressure in the wake of the repair,” NASA said.

No one has officially named the cause of the leak, but one culprit could be a tiny piece ofspace junk.

The US government tracks about 23,000 human-made objects floating in space that are larger than a softball. These satellites and chunks of debris zip around the planet at more than 17,500 mph — roughly 10 times the speed of a bullet. Until April 1, the list of space junk even included China’s school-bus-size Tiangong-1 space station, which burned upin Earth’s atmosphere.

However, there are millions of smaller pieces of space junk— sometimes called micrometeoroids — orbiting Earth, too.

“There’s lots of smaller stuff we can see but can’t put an orbit, a track on it,” Jesse Gossner, an orbital-mechanics engineer who teaches at the US Air Force’s Advanced Space Operations School, told Business Insider.

As companies and government agencies launch more spacecraft, concerns are growing about the likelihood of a “Kessler syndrome” event: a cascading series of orbital collisions that may curtail human access to space for hundreds of years.

Here’s who is keeping tracking of space junk, how satellite collisions are avoided, and what is being done to prevent disaster on the final frontier.

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