According to the space agency, Russian cosmonaut Pyotr Dubrov, who has spent 355 days, three hours, 45 minutes, and 21 seconds on the ISS, a feat that he surpassed on Monday, holds the current record.
Prokopyev and Petelin arrived at ISS in September 2022, and their space stay was expected to last until March. Due to a failure of the thermal radiator of the Soyuz MS-22 spacecraft, their mission will end on September 27.
Although both cosmonauts will set a record for a stay on the ISS, Russian cosmonaut Valery Polyakov, who spent a record of 437 days, 17 hours, 58 minutes, and 17 seconds aboard the Mir space station (now dismantled), holds the world record for the longest single stay in space since 1995.
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