NASA Delays Spacewalks Due to ISS Coolant Leak

The ISS as pictured from the SpaceX Crew Dragon Endeavour during a fly around in 2021.

As NASA looks into the most recent incident of a leak from the International Space Station (ISS), two spacewalks have been delayed until ongoing investigations are complete.

NASA postponed spacewalks that were originally scheduled for Thursday, October 12 and Friday, October 20, with new dates for the extravehicular activities to be announced later, the space agency wrote in a blog update on Wednesday.

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This is the third time a leak has sprung from Russian hardware attached to the ISS. In December 2022, ground teams observed a fountain of particles pouring out from a Soyuz spacecraft docked to the ISS. The spacecraft carried NASA astronaut Frank Rubio and Roscosmos cosmonauts Sergey Prokopyev and Dmitri Petelin to the ISS in September 2022, and was supposed to transport them back home in the spring of this year. Due to the leak, however, the trio’s stint on the ISS was extended by another six months.

At the time, Russia attributed the first leak to a micrometeorite strike on the spacecraft. Shortly after, however, a Russian Progress 82 freighter docked to the ISS also began leaking coolant in February. Russia’s space agency again claimed that it was caused by an external impact but the second incident put the integrity of both Russian spacecraft into question, with suspicion emerging that there are common manufacturing defects or something having to do with launch preparations.

Now, with the third incident of a coolant leak in less than a year, Roscosmos has some explaining to do.

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