Ammonia leak on Russian section of International Space Station 'has now ceased,' but astronauts remain cautious

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Ammonia leak on Russian section of International Space Station 'has now ceased,' but astronauts remain cautious
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Elizabeth Howell is a regular contributor to Live Science and Space.com, along with several other science publications. She is one of a handful of Canadian reporters who specializes in space reporting. Elizabeth has a Bachelor of Journalism, Science Concentration at Carleton University (Canada) and an M.Sc.

On Wednesday , a coolant leak on a Russian module of the International Space Station appears to have stopped two days after being discovered, NASA wrote in a blog post.

Agency astronaut Jasmin Moghbeli confirmed the backup radiator leak after looking at it through the station's wrap-around cupola windows, NASA officials wrote in an update five hours later. The leaky backup radiator was originally for a different Russian module aboard the space station, called Rassvet, and was delivered to the ISS via space shuttle mission STS-132 in 2010. A Roscosmos spacewalk in April 2023 transferred the then-functional backup radiator to Nauka.

"You've got three coolant systems leaking — there's a common thread there. One is whatever, two is a coincidence, three is something systemic," McDowell said in the report. McDowell is an astrophysicist and astronomer who also tracks launches, re-entries and other major spaceflight milestones. Soyuz crews typically launch every six months. As such, the relief Soyuz crew wasn't fully trained yet for the accelerated MS-23 launch in February 2023, necessitating a wait until yet another spacecraft was ready in September to carry them to the ISS.

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