Why NASA has sent four astronauts back to Earth from ISS and cut their space mission by over a month in a historic first

In a historic event for NASA, four astronauts- two Americans, a Russian and a Japanese- departed the International Space Station (ISS) and have returned to Earth a month early. This is the first medical evacuation since the station was put into Earth's orbit in 1998. This was NASA's first-ever medical evacuation from the ISS to bring back an astronaut in need of medical care. Four astronauts are back on Earth after a 167-day mission cut short by illness. At exactly 2:11 pm IST, the SpaceX Dragon capsule Endeavour successfully splashed down in the Pacific Ocean near San Diego. The agency did not provide details about the crew member or the nature of the medical issue, but said they were in stable condition.

“Our timing of this departure is unexpected,” Nasa astronaut Zena Cardman said before the return trip, “but what was not surprising to me was how well this crew came together as a family to help each other and just take care of each other.” Though NASA officials have not revealed the identity of the ailing astronaut or the nature of the health concerns, citing medical privacy, but confirmed the individual is stable and safe.

Outgoing ISS commander Mike Fincke reassured that the astronaut is “stable, safe and well cared for,” noting that “this was a deliberate decision to allow the right medical evaluations to happen on the ground, where the full range of diagnostic capability exists.” Control of the ISS has been handed over to Russian cosmonaut Sergey Kud-Sverchkov and two other crew members.


"First and foremost, we are all OK. Everyone on board is stable, safe, and well cared for," Fincke said, adding that it was a "deliberate decision to allow the right medical evaluations to happen on the ground, where the full range of diagnostic capability exists. It's the right call, even if it's a bit bittersweet."

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Why NASA called astronauts back

The astronauts, Mike Fincke and Zena Cardman, Japan's Kimiya Yui and cosmonaut Oleg Platonov, arrived on the ISS on 1 August expecting to complete a standard six and a half month stay and were scheduled to return in mid-February. Last week on January 7, NASA cancelled a scheduled spacewalk by Fincke and Cardman at the last minute and hours later, the space agency revealed a crew member had become ill. "It's bittersweet," said Fincke when he handed over the keys to the ISS to Kud-Sverchjov on Monday.

Officials emphasised that the health issue was unrelated to the spacewalk or other station operations and stressed that it was not an emergency situation. Nasa confirmed that standard splashdown and recovery procedures will be followed, with medical teams on hand aboard the Pacific recovery ship. It is not yet clear how soon all four astronauts will be flown from California to Houston, home of the Johnson Space Center. James Polk, Nasa’s chief health and medical officer, said the decision was driven by a “lingering risk” and a “lingering question as to what that diagnosis is.”

The return marked another overnight crew recovery for SpaceX, occurring less than 11 hours after undocking from the space station. One US astronaut and two Russian cosmonauts remain aboard the International Space Station, just six weeks into an eight-month mission that began with a Soyuz launch from Kazakhstan. NASA and SpaceX are now working to bring forward the launch of a replacement four-person crew from Florida, which is currently scheduled for mid-February.

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NASA officials said it would have been riskier to keep the ailing astronaut in orbit for another month than to temporarily cut the station’s crew by more than half. Until the next team arrives, both routine and emergency spacewalks—which require a two-person crew with additional backup support—will be suspended. The medical evacuation marks the first major decision by Nasa’s new administrator, Jared Isaacman, who took office in December. “The health and the well-being of our astronauts is always and will be our highest priority,” Isaacman said when announcing the decision last week.

NASA and SpaceX are now working to move up the launch of a new four-member crew from Florida, which is currently scheduled for mid-February. While computer modelling had long suggested that a medical evacuation from the ISS could occur roughly once every three years, NASA said this is the first such evacuation in its 65-year history of human spaceflight.

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