The oxygen-supply system on the International Space Station’s Russian segment failed this week.

Crew members aren’t in danger, since the station has another oxygen system on its US segment.

But the issue is the latest in a string on the station’s Russian side — there has also been a broken toilet and an air leak. 

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The International Space Station is starting to show its age, particularly on the Russian side. In the last few months, a toilet in that segment went bust, an air leak got larger, and temperatures mysteriously increased.

Then on Wednesday, the Russian segment’s oxygen-supply system failed, according to space agency Roscosmos. The Zvezda service module, where the system is located, has been in orbit for 20 years.

The failure coincided

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