When NASA astronauts Butch Wilmore and Suni Williams climbed into Boeing’s Starliner capsule on June 5, 2024, they expected to be back on Earth in just over a week. Instead, a cascade of technical failures turned an eight-day test flight into a 286-day stay aboard the International Space Station. The mission, initially designed to certify Starliner for routine crew rotations, became one of the most closely watched episodes in modern spaceflight—not because of what went right, but because of what went wrong.
The two veteran astronauts finally splashed down in March 2025, not aboard the spacecraft that carried them to orbit, but on a SpaceX Crew Dragon. Their prolonged stay raised urgent questions about spacecraft reliability, astronaut safety, and the resilience of the human body during extended weightlessness. Here is the full story of how a routine test flight became a nine-month ordeal, grounded in verified facts from NASA, official reports, and the astronauts themselves.
Why Were Astronauts Stuck in Space for 9 Months?
The core reason Wilmore and Williams remained on the ISS far longer than planned was a series of propulsion-system failures on Boeing’s Starliner. What was supposed to be a straightforward crewed test flight turned into a safety standoff as engineers struggled to determine whether the spacecraft could bring its crew home.
Butch Wilmore and Suni Williams, both veteran NASA astronauts with previous spaceflight experience.
A Boeing Starliner crewed test flight that became an unplanned long-duration mission due to technical failures.
Launched June 5, 2024; returned March 18, 2025 — 286 days in orbit.
Helium leaks and thruster malfunctions made Starliner unsafe for crew return; NASA opted for a SpaceX rescue.
- Key insight 1: The 8-day mission turned into 286 days due to cascading thruster and helium leak issues.
- Key insight 2: Despite being ‘stuck’, the astronauts contributed actively to ISS science and maintenance.
- Key insight 3: NASA and Boeing chose to return Starliner empty and bring the crew back via SpaceX Crew Dragon.
- Key insight 4: The extended stay provided valuable data on long-duration adaptation for future Mars missions.
- Key insight 5: NASA repeatedly stated the astronauts were never in immediate danger, though risks were elevated.
| Fact | Detail |
|---|---|
| Mission duration (planned) | 8 days |
| Mission duration (actual) | 286 days |
| Launch date | June 5, 2024 |
| Return date | March 18, 2025 |
| Spacecraft used for launch | Boeing Starliner |
| Spacecraft used for return | SpaceX Crew Dragon (Crew-9) |
| Astronauts’ previous spaceflight experience | Both veteran NASA astronauts with prior ISS missions |
| Total days in space this mission | 286 |
| Starliner return method | Uncrewed, empty return to Earth (September 2024) |
| NASA decision date to return without crew | August 2024 |
What Technical Issues Plagued the Starliner?
The problems surfaced almost immediately after launch. Within hours of docking with the ISS on June 6, 2024, NASA engineers identified helium leaks in the spacecraft’s propulsion system. Helium is used to pressurize the fuel lines for the reaction control system thrusters. A leak compromises the ability to control the capsule’s orientation and perform critical maneuvers for deorbit and reentry.
Alongside the helium leaks, several thrusters in the reaction control system malfunctioned during the docking sequence. Ground tests conducted in the weeks that followed confirmed that the thrusters were not performing to the safety margins required for crewed flight. According to NASA’s official Starliner mission page, engineers spent “weeks analyzing data, running ground tests, and reviewing contingency plans.” Ultimately, the agency concluded the spacecraft did not meet human-spaceflight safety requirements for return.
Why Didn’t the Astronauts Return on the Same Spacecraft?
NASA faced a difficult choice: bring the crew home on a spacecraft with known propulsion issues, or return Starliner empty and arrange an alternative ride. The agency chose the latter. “The risks were not acceptable for human flight,” NASA said in a statement at the time. Starliner undocked from the ISS in early September 2024 and landed on Earth without a crew. The decision effectively marooned Wilmore and Williams on the station until another vehicle could fetch them.
What Role Did NASA Play in the Decision to Extend the Stay?
NASA’s leadership, including the agency’s chief of human spaceflight, made the final call after consulting with Boeing engineers and independent safety panels. The decision was driven by data, not schedule pressure. “This was a safety decision, not simply a scheduling delay,” NASA emphasized. The astronauts were reassigned to the International Space Station‘s regular crew rotation and continued working as full members of the expedition team while NASA arranged their return on a SpaceX Crew Dragon as part of the Crew-9 sequence.
How Long Were They Supposed to Be There vs. How Long Did They Stay?
The gap between plan and reality is stark. Wilmore and Williams prepared for a brief shakedown flight of a new spacecraft. They ended up spending more than nine months in orbit — longer than many ISS expeditions that are deliberately scheduled for long-duration research.
What Was the Original 8-Day Mission Plan?
The Starliner Crewed Flight Test (CFT) was designed as the final step before NASA certified the spacecraft for regular crew rotation missions. The plan called for a launch, docking with the ISS, a few days of systems checks, and a return to Earth. The entire mission was expected to last about 8 days. Neither Wilmore nor Williams packed for an extended stay — they brought standard clothing and personal items for a short trip.
How Many Days Did Butch Wilmore and Suni Williams Actually Spend?
They spent 286 consecutive days in orbit. While that is exceptionally long for a test flight, it is not unusual in the broader context of ISS missions. NASA astronaut Frank Rubio, for example, spent 371 days on the station in 2022–2023 after a Soyuz coolant leak stranded him. Compared to Rubio, Wilmore and Williams spent about 85 fewer days in space — but their mission was originally supposed to be more than 40 times shorter.
Who Holds the Record for the Longest Continuous Stay in Space?
The record belongs to Russian cosmonaut Valeri Polyakov, who spent 437 consecutive days aboard the Mir space station in 1994–1995. Among NASA astronauts, Mark Vande Hei holds the U.S. record at 355 days. Wilmore and Williams did not break any records for endurance, but their situation was unique because the extension was unplanned and driven by a spacecraft failure rather than a scheduled long-duration mission.
What Were the Health Concerns for the Astronauts?
Extended exposure to microgravity affects nearly every system in the human body. While astronauts on long-duration ISS missions typically recover after returning to Earth, the unplanned nature of Wilmore and Williams’ stay added an element of uncertainty.
Medical research on long-duration spaceflight documents several predictable effects: muscle atrophy and bone density loss, fluid shifts that can alter vision, changes in cardiovascular function, balance disorders, and immune system modulation. These effects are well-documented by space medicine studies and are actively monitored on all ISS missions, whether planned or extended.
What Physical Changes Occur After 9 Months in Space?
Muscle and bone loss begin within days of entering microgravity and accelerate over time. Without the constant pull of gravity, weight-bearing muscles weaken and bones lose mineral density at a rate of about 1% per month. Fluid shifts cause blood and other fluids to pool in the upper body, which can lead to facial puffiness and increased pressure on the eyes, sometimes resulting in temporary vision changes known as Spaceflight-Associated Neuro-ocular Syndrome (SANS).
How Did They Prevent Bone and Muscle Loss?
Exercise is the primary countermeasure. The ISS is equipped with a treadmill, a stationary bicycle, and the Advanced Resistive Exercise Device (ARED), which uses vacuum cylinders to simulate weightlifting. Wilmore and Williams followed a rigorous daily exercise routine of about two hours per day. Despite this, some bone and muscle loss is inevitable during stays of this length, and recovery typically takes several months after return to Earth.
What Mental Health Challenges Did They Face?
The psychological strain of an extended, unplanned mission can be significant. Isolation from family, the uncertainty of when they would return, and the confinement of the ISS all contribute to stress. However, both astronauts have publicly stated that they were mentally prepared for the possibility of an extended stay. “We never felt stranded… we were prepared to stay longer,” Wilmore told NBC News after returning. Regular communication with family via video calls and email helped maintain morale.
How Did the Astronauts Eat, Sleep, and Work on the ISS?
Daily life on the ISS follows a structured routine regardless of whether a crew member is there for a short visit or a long expedition. Wilmore and Williams integrated into the existing crew schedule, performing everything from scientific experiments to routine maintenance.
Food is delivered to the ISS via cargo resupply missions operated by SpaceX, Northrop Grumman, and the Russian space agency. Wilmore and Williams had access to the same packaged and rehydratable meals as the rest of the crew, including freeze-dried entrees, shelf-stable fruits, nuts, and beverages. Water is recycled from urine, humidity, and other sources. The station’s water recovery system produces enough clean water for drinking, food preparation, and hygiene.
How Is Food Supplied to the ISS?
Cargo spacecraft arrive regularly, bringing fresh food, supplies, and experiment hardware. The station typically maintains several months of food reserves as a safety buffer. Wilmore and Williams did not face any food or water shortages during their extended stay because the resupply schedule continued normally. Fresh fruits and vegetables are occasionally delivered and consumed quickly; the rest of the diet consists of shelf-stable, packaged meals.
What Experiments Did They Conduct?
As full members of the ISS crew, Wilmore and Williams participated in a wide range of scientific investigations. These included biology studies on how microgravity affects cellular processes, physics experiments on fluid dynamics, materials science research, and Earth observation projects. They also performed Starliner-specific system testing and data analysis during their downtime, helping engineers on the ground understand the spacecraft’s propulsion anomalies.
How Did They Exercise to Stay Fit?
Exercise is mandatory on the ISS. The daily regimen typically includes about 60 minutes of aerobic exercise on the treadmill or cycle ergometer and 60 minutes of resistance training using the ARED. This routine is designed to minimize bone loss, maintain muscle mass, and preserve cardiovascular fitness. Without it, astronauts would be significantly weaker and at higher risk of injury upon returning to Earth’s gravity.
When and How Did They Finally Return to Earth?
After months of planning and preparation, Wilmore and Williams boarded a SpaceX Crew Dragon spacecraft in March 2025 and returned to Earth. The journey from the ISS to splashdown took about 19 hours.
Why Did They Return in March 2025?
The timing was driven by the scheduled rotation of ISS crews. Wilmore and Williams were reassigned to the Crew-9 mission, which had its own pre-planned return date. NASA decided against launching a separate rescue mission, instead integrating the two astronauts into the existing crew rotation. This approach minimized disruption to station operations and avoided the cost of an additional spacecraft launch.
How Did NASA Arrange Their Return on a SpaceX Crew Dragon?
NASA worked with SpaceX to adjust the Crew-9 manifest, adding Wilmore and Williams to the return trip. The Crew Dragon spacecraft that brought them home was already docked at the station as part of the regular crew rotation. The two astronauts simply boarded the vehicle with the Crew-9 team and undocked when the mission’s stay duration was complete. This flexibility is a key feature of NASA’s commercial crew program, which maintains two independent crew transportation systems (SpaceX and, when certified, Boeing).
NASA determined that the risk of bringing Wilmore and Williams home on Starliner, given the thruster and helium leak issues, was not acceptable. The spacecraft was programmed for an autonomous undocking and reentry, which it executed successfully in September 2024. The decision to send Starliner back empty reinforced the agency’s stated policy of prioritizing crew safety over spacecraft certification timelines.
What Was the Reaction When They Landed?
The Crew Dragon splashed down off the coast of Florida on March 18, 2025. Recovery teams reached the capsule within minutes, and the astronauts were assisted out of the spacecraft by medical staff. Both Wilmore and Williams appeared in good spirits, though they required assistance walking due to the effects of gravity after nine months in microgravity. “We never felt stranded… we were prepared to stay longer,” Wilmore told reporters during a post-landing press conference. Suni Williams added, “The team on the ground was fantastic,” as reported by BBC News.
When Did the Key Events of the Starliner Mission Unfold?
The timeline below traces the mission from launch to return, including the technical failures and NASA decisions that defined the trajectory of this unusual spaceflight.
- June 5, 2024: Starliner crewed test flight launches from Cape Canaveral with Butch Wilmore and Suni Williams aboard.
- June 6, 2024: NASA identifies helium leaks and multiple thruster malfunctions during the docking approach to the ISS.
- June–August 2024: Engineers conduct extensive ground tests and data analysis to assess whether Starliner is safe for crew return.
- August 2024: NASA announces that Starliner will return to Earth without its crew, citing unacceptable safety risks.
- Early September 2024: Starliner undocks from the ISS and lands autonomously on Earth — empty.
- September 2024 – March 2025: Wilmore and Williams are reassigned to the ISS crew rotation and continue station work while awaiting a ride home on SpaceX Crew Dragon.
- March 18, 2025: Crew Dragon splashes down off the coast of Florida, ending the 286-day mission.
What Is Known and What Remains Uncertain?
While many details of the Starliner incident are well-documented, several questions remain open — particularly regarding long-term health effects and the future of the Boeing spacecraft.
| Established Information | Information That Remains Unclear |
|---|---|
| Helium leaks and thruster failures caused the propulsion system to perform below safety thresholds. | The exact long-term health effects on Wilmore and Williams will not be fully understood for months or longer. |
| NASA decided to return Starliner empty and bring the crew home on SpaceX Crew Dragon. | The timeline for Boeing Starliner to receive full NASA certification is uncertain; additional uncrewed tests may be required. |
| The astronauts were assessed by medical teams upon landing and were in stable condition. | Whether the crew could have returned earlier on a different vehicle (e.g., Soyuz) was not publicly discussed in detail by NASA. |
| NASA stated the astronauts were never in immediate danger but faced elevated risk if they had returned on Starliner. | The root cause of the thruster failures has not been fully resolved; investigations are ongoing. |
How Does the Starliner Setback Affect NASA’s Commercial Crew Program?
The incident represents a significant setback for Boeing’s Starliner program and has broader implications for NASA’s strategy of relying on two commercial providers for crew transportation to the ISS. Boeing has spent years developing Starliner under a fixed-price contract with NASA, and the spacecraft has faced repeated delays and technical problems since its first uncrewed test flight in 2019.
The situation also underscores NASA’s increasing reliance on SpaceX, which has successfully flown multiple crew rotation missions since 2020. The Crew Dragon vehicle that brought Wilmore and Williams home was already on station, demonstrating the operational flexibility of having multiple crew systems available. Without that redundancy, the astronauts may have faced an even longer wait for a return vehicle.
Compared to other ISS mission extensions — such as Frank Rubio’s 371-day stay in 2022–2023 after a Soyuz coolant leak — the Starliner incident highlights a recurring challenge in human spaceflight: spacecraft are complex machines, and failures can upend even the most carefully planned missions. The lesson NASA consistently draws from these events is that safety must override schedule pressure, even when it means leaving astronauts on the station far longer than anticipated.
What Did the Astronauts and NASA Officials Say?
Both Wilmore and Williams spoke publicly after their return, and a NASA investigation later provided additional detail on the safety concerns that drove the decision to bring Starliner back empty.
“We never felt stranded… we were prepared to stay longer.”
— Butch Wilmore, NBC News, March 2025
“The team on the ground was fantastic.”
— Suni Williams, BBC News, May 2025
“The Starliner had a significant number of safety concerns.”
— NASA Office of Inspector General report on Starliner, as cited by Sky News, February 2026
These statements reinforce the message that while the situation was stressful and unplanned, the astronauts remained focused on their work and supported by ground teams. NASA’s official stance has consistently been that the decision to return Starliner uncrewed was driven by a data-driven safety assessment, not by panic or political pressure.
What Happens After the Return?
Wilmore and Williams now face a period of medical monitoring and rehabilitation as their bodies readapt to Earth’s gravity. The data collected from their extended stay — including the psychological and physiological effects of an unplanned long-duration mission — will inform NASA’s planning for future deep-space missions, including Artemis flights to the Moon and eventually crewed missions to Mars. For Boeing, the path forward involves resolving the Starliner propulsion issues, completing NASA’s recertification process, and demonstrating that the spacecraft can safely carry crew. The incident has reinforced NASA’s commitment to maintaining multiple crew transportation options, ensuring that no single spacecraft failure can leave astronauts without a way home.
For those interested in the broader themes of space exploration and human endurance, the story of Wilmore and Williams is a reminder that spaceflight remains a difficult and unpredictable endeavor — and that the people who fly these missions are prepared for far more than the script calls for. For more on how space missions are planned and what happens when things go wrong, see Alien: Earth Episode Guide and The Fantastic Four: First Steps.
Frequently Asked Questions
Did the astronauts run out of food or water?
No. The ISS receives regular cargo resupply missions, and the station maintains several months of food and water reserves as a safety buffer. Wilmore and Williams never faced shortages.
Could the astronauts have returned earlier on a Soyuz?
In theory, a seat on a Soyuz could have been arranged, but NASA chose to keep Wilmore and Williams on the ISS and bring them home on a SpaceX Crew Dragon as part of the regular crew rotation instead.
Were the astronauts ever truly ‘stuck’ or was it planned?
The extension was unplanned, but NASA emphasized the astronauts were never abandoned. They remained active, working crew members. “Stuck” describes the unexpected duration, not a lack of support or resources.
How did the astronauts communicate with family?
The ISS has internet-connected computers that allow astronauts to send emails, make video calls, and call family members via phone. Wilmore and Williams stayed in regular contact with their families throughout the extended stay.
What was the cost of the extended mission?
NASA did not release a specific cost for the extension alone. However, the overall Starliner program has cost billions, and the use of a SpaceX Crew Dragon for return added logistical and integration costs that were absorbed under existing contracts.
Will the astronauts fly on Starliner again?
It is not yet clear. Both Wilmore and Williams are veteran astronauts who may continue flying, but future assignments depend on NASA’s crew rotation schedule and Boeing’s Starliner certification timeline.
Freddie Harry Cooper Bennett is a staff writer for DailyPressUK.co.uk, covering UK news, politics, business and culture. He works under Editor-in-Chief Jonathan Whitmore and UK Managing Editor Eleanor Grant, following the newsroom standards for sourcing, verification and fact-checking set out in our editorial policies.