They set off to spend eight days at the space station. The trip lasted nine months.
On Tuesday, two NASA astronauts who had been in orbit since June, Suni Williams and Butch Wilmore, splashed down in calm, azure waters off the coast of the Florida Panhandle, concluding a saga that had captivated the country since last summer.
Ms. Williams and Mr. Wilmore blasted off in June for the International Space Station on their test flight of Starliner, a Boeing spacecraft that was to provide NASA with another option, outside of SpaceX, to carry astronauts to and from orbit. But the Starliner experienced problems with its propulsion system, prompting NASA to send it back to Earth with no crew aboard.
It was a SpaceX capsule, the Crew Dragon, that brought them back from space on Tuesday. The spacecraft detached from the space station just after 1 a.m. Eastern time and then traveled back to Earth, slowing from more than 17,000 miles an hour before deploying four large parachutes that gently plopped the spacecraft into the water just before 6 p.m.
Minutes later, as recovery teams inspected the capsule, a pod of curious dolphins circled, a playful terrestrial welcoming party.
Once the capsule had been hoisted onto a ship, the door was opened and the beaming astronauts were extracted from the spacecraft. After months of weightlessness, their bodies still adjusting to the pull of gravity, they were lifted onto gurneys.
“They all looked very healthy,” Steve Stich, the manager of NASA’s commercial crew program, said during a news conference after the splashdown. “They all looked like they were feeling about normal for the landing and recovery phase, where their body is trying to re-adapt.”
Returning with the two astronauts were Nick Hague, the commander of this mission known as Crew-9, and Aleksandr Gorbunov, a Russian astronaut.
The four astronauts were scheduled to fly back to NASA’s Johnson Space Center in Houston, where they were to remain briefly until doctors let them go home. “They’ll join their families in the next day or so,” Mr. Stich said.
The mission both underlined the dominance of SpaceX in the growing field of private spaceflight, and the comparative woes of Boeing. But as with so many things in the early stages of the Trump administration, the astronauts’ return was tinged with politics.
President Trump suggested in January that the Biden administration had stranded the astronauts, and Elon Musk, the founder of SpaceX, said this month that the Biden administration had rejected his offer to bring them home sooner.
But Bill Nelson, who served as the administrator of NASA during the Biden administration, said that NASA never heard about Mr. Musk’s offer, and that the agency’s decisions were based on what made the most sense for the operations of the space station.
“On the basis that there was no contact with NASA, there was no political consideration from NASA’s point of view,” Mr. Nelson said.
About a half-hour after the astronauts returned, the White House posted on social media, “PROMISE MADE, PROMISE KEPT: President Trump pledged to rescue the astronauts stranded in space for nine months.”
However, it has been NASA’s plan since August for the Crew-9 mission to return with Ms. Williams and Mr. Wilmore around this time frame.
An hour later after the White House post, Mr. Musk offered celebratory congratulations on X to teams at SpaceX and NASA “for another safe astronaut return!” He also thanked President Trump “for prioritizing this mission!”
But the astronauts also disputed the notion that they were stuck in space.
“It’s work. It’s fun. It’s been trying at times, no doubt,” Mr. Wilmore said in an interview from the space station last week with The New York Times. “But ‘stranded’? No. ‘Stuck’? No. ‘Abandoned’? No.”
At the station, Ms. Williams and Mr. Wilmore had to adjust to their unexpectedly long stay. From the start, they were short of clothes, because their suitcases had been left off the Starliner to make room for a replacement pump to fix the toilet. They relied on spare clothing in the space station.
NASA sent up their clothes and other personal items a couple of months later on a Northrop Grumman cargo ship. Such robotic cargo ships arrive periodically from Russia and the United States, bringing food, supplies and experiments.
According to a summary published by NASA, astronauts at the space station, which orbits about 250 miles above the Earth, carried out a variety of tasks on the station, including maintenance work and nearly a thousand hours of scientific research.
That included a spacewalk by Ms. Williams and Mr. Wilmore to swab the outside of the space station to see if Earth microbes could survive and maybe even thrive in space.
Ms. Williams also helped set up an experiment to study how microbes produced nutrients like vitamins, and also conducted research on how weightlessness affected microscopic organisms that could be used to make food and medicines, NASA said.
The astronauts were able to connect with friends, family and the public on the ground — they had access to email and video calls. They tried to put a positive spin on the whole experience.
“You get a little bit more time to enjoy the view out the window,” Ms. Williams said in the interview with The Times last week.
Not everything they saw was pleasing. From space, Mr. Wilmore saw Hurricane Beryl, which hit Houston last July. The storm damaged the roof of his home. The astronauts also saw the smoke from the Los Angeles fires in January.
Mr. Wilmore, who has a wife and two children, missed most of his younger daughter’s senior year of high school and his elder daughter’s sophomore year in college.
He said his younger daughter was “tough,” but she also told him, “I didn’t know how much I needed you until you were gone.”
Nine months is not an unusually long stay for astronauts in space — Frank Rubio holds the record for the longest stay in space by an American astronaut at 371 days — but Mr. Wilmore and Ms. Williams nonetheless had to ward against the damage that space could inflict on the body. Without gravity, bone mass tends to diminish, a space version of osteoporosis. The astronauts worked out on the modified gym equipment in the space station, which included a treadmill with a harness that keeps the runner from floating away.
By the end of their journey, Ms. Williams and Mr. Wilmore had traveled nearly 121,347,500 miles, having orbited the earth 4,576 times. Mr. Wilmore has spent a total of 31 hours conducting spacewalks during his career and Ms. Williams 62 hours, a record for a woman astronaut.
Their 286 days in space, including the trip up in June and the descent on Tuesday, was long. But their mission was perhaps not as dramatic as the one carried out by Sergei Krikalev, a Soviet astronaut who blasted off on May 18, 1991, for a stay at the Soviet Union’s space station, Mir.
While Mr. Krikalev was orbiting the earth, the Soviet Union disbanded, and he was asked to extend his stay by almost five months, in part because of his country’s disintegration and money problems in Moscow.
He ended up staying in space for 313 days, returning to a home country that no longer existed.
Reporting was contributed by Talya Minsberg, Claire Moses, Michael Roston and John Yoon.
