With a fresh crew now aboard the International Space Station, the four fliers they are replacing — including long-delayed Starliner astronauts Barry “Butch” Wilmore and Sunita Williams — packed up Monday for their return to Earth to finally close out an extended 286-day stay in space.
Wilmore and Williams, who launched last June aboard Boeing’s problem-plagued Starliner capsule, will be joined for their trip home by Crew 9 commander Nick Hague and cosmonaut Alexander Gorbunov, who launched to the station last September aboard a SpaceX Crew Dragon capsule.
For Wilmore and Williams, splashdown will close out a repeatedly extended mission totaling 286 days and 7 hours. They originally expected to spend just eight days or so in orbit.
NASA 
How will the astronauts return to Earth?
Undocking from the ISS Harmony module’s space-facing port was planned for 1:05 a.m. EDT Tuesday.
Sixteen hours later, the flight plan called for an automated seven-and-a-half-minute de-orbit thruster firing starting at 5:11 p.m. to slow the ship down for re-entry.
After a 27-minute free fall, the spacecraft was expected to plunge back into the discernible atmosphere for the final 12 minutes of the descent, making a parachute-assisted splashdown off the Florida panhandle’s Gulf Coast at 5:57 p.m. EDT Tuesday.
A SpaceX recovery ship will be stationed nearby to haul the spacecraft on board so the crew can be helped out of the Crew Dragon’s cabin and onto stretchers for initial medical checks.
Why were the astronauts stuck longer at the ISS?
Wilmore and Williams launched to the International Space Station last June 5 on the first piloted test flight of Boeing’s Starliner. The spacecraft suffered multiple propulsion system helium leaks and thruster problems during rendezvous with the space station, and NASA eventually decided to keep them on the station and to bring the Starliner down, without its crew, by remote control.
NASA launched the next crew rotation mission — Crew 9 — in September carrying just two crew members, Hague and Gorbunov, instead of four. Wilmore and Williams then joined the Crew 9 fliers aboard the ISS for a normal-duration six-month mission.
NASA 
By keeping them in space as part of Crew 9, NASA was able to minimize the disruption to the ISS crew rotation sequence while maintaining a full slate of experiments and research.
NASA cleared the way for Crew 9’s return to Earth by launching four replacements — Crew 10 commander Anne McClain, pilot Nichole Ayers, cosmonaut Kirill Peskov and Japanese astronaut Takuya Onishi — last Friday.
Normal practice calls for a five-day “handover” between crews so the new arrivals can be fully briefed on the ins and outs of station operations and maintenance. But in this case, handover was shortened to just one day to take advantage of predicted favorable splashdown weather in the Gulf.
NASA 
All station astronauts spend two hours a day exercising to minimize bone and muscle loss in the weightlessness of space. Even so, Wilmore and Williams will face extensive rehabilitation over the next several weeks and months as their bodies re-adapt to the unfamiliar tug of gravity.
Hague and Gorbunov, who spent spent 171 days in space, will re-adapt more quickly, perhaps, but both will require physical therapy.
Was this the longest any U.S. astronaut has stayed in space?
While 286 days is a long flight by normal NASA standards, it’s well short of the U.S. record for a single flight — 371 days, set by astronaut Frank Rubio in 2022-23.
Ironically, Rubio’s record was the result of another extended mission, this one the result of a major coolant leak in the Russian Soyuz he launched aboard. The Russians decided not to bring the crew down aboard their original spacecraft and instead launched a replacement.
As a result, Rubio ended up spending a little more than a full year in space, twice as long as he originally expected.
Given Williams’ two previous stays aboard the space station, she will move up to No. 2 on the list of most experienced U.S. astronauts with 608 days in space overall. Only former astronaut Peggy Whitson has more time aloft, 675 days over four flights. Wilmore’s total across three flights will stand at 464 days aloft.
