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Astronauts and cosmonauts the International Space Station (ISS) have fixed a hole the shell its outer wall. The ISS is a large satellite in space that scientists live to do scientific experiments. The first part it was put into space in 1998. Last week, NASA alerted astronauts the ISS that the station was slowly leaking air. Astronaut Alexander Gerst and five other astronauts started looking the leak. Mr Gerst eventually found it and quickly used a simple and effective way stopping the leak - he put his finger the hole. Luckily, the hole was only two millimeters wide so it was not a major emergency, but it did need fixing.

The hole was a docked Russian Soyuz MS-09 spacecraft. NASA said it could have been caused a small piece space junk or a small meteorite colliding the spacecraft. The ISS travels speeds of around 28,000 kph. Even a tiny object hitting it can cause a lot damage. Flight controllers the USA and Russia worked together with the crew to fix the hole. The Soyuz commander, Sergey Prokopyev, used a heat-resistant "space tape" and a special glue to plug the hole. These are part a "necessary space repair kit". A NASA official said the crew the ISS are safe the repair. He said: "The crew are healthy and safe with weeks air left in the International Space Station reserves."

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