NASA Astronauts to Extend ISS Stay as Boeing Starliner Returns Uncrewed

Two astronauts who traveled to the International Space Station (ISS) aboard Boeing’s Starliner will be returning to Earth on a different spacecraft next year, as announced by NASA officials on Saturday. Astronauts Barry “Butch” Wilmore and Sunita “Suni” Williams, who participated in the first crewed test flight of Boeing’s Starliner, are now scheduled to return in February 2025 aboard the SpaceX Crew-9 mission, according to NASA. The Boeing Starliner, meanwhile, will return to Earth separately in an uncrewed flight.

NASA Administrator Bill Nelson emphasized that this decision was made with safety as the primary concern. “The decision to keep Butch and Suni aboard the International Space Station and bring the Boeing Starliner home uncrewed is a result of a commitment to safety,” Nelson stated at a news conference.

Wilmore and Williams launched to the ISS on June 5, with the original plan for a short one-week stay and return on June 14. However, their return has been postponed multiple times due to ongoing assessments and safety checks. While on the ISS, Wilmore and Williams have integrated into the “Expedition 71” crew, contributing to research and other station responsibilities. This extended stay has led to increased usage of supplies initially designated for the ISS crew, NASA officials have reported.

Steve Stich, the program manager for NASA’s Commercial Crew Program, explained that NASA’s decision was influenced by concerns regarding the Starliner’s thrusters. “There was too much risk for the crew,” Stich stated, reflecting the caution exercised by NASA after a summer spent analyzing data on the spacecraft.

Boeing responded to the situation, affirming their commitment to safety. “We continue to focus, first and foremost, on the safety of the crew and spacecraft,” a Boeing spokesperson said. “We are executing the mission as determined by NASA, and we are preparing the spacecraft for a safe and successful uncrewed return.”

During their extended stay, Wilmore and Williams will continue to support scientific experiments, conduct maintenance, and possibly participate in spacewalks on the ISS. The upcoming SpaceX Dragon Crew-9 mission, slated for launch in September, will now carry only two of its originally planned four astronauts to make room for Wilmore and Williams on the return trip. Additional spacesuits will be provided to accommodate the extra passengers.

“As we started looking at various options, it was obvious to both of us that the easiest and best option was to configure the Crew-9 vehicle with a couple of empty seats on the way up,” Stich explained.

A significant factor in the decision to leave Starliner uncrewed for its return is its current inability to autonomously undock from the ISS. To achieve autonomous undocking, Starliner would require a software update and additional training for Boeing’s flight control team.

Starliner is part of NASA’s broader Commercial Crew Program, which aims to certify various spacecraft for routine missions to and from the ISS. The spacecraft has faced multiple challenges throughout its development. Initially planned for launch on May 6, the test flight was delayed due to an issue with an oxygen valve on a rocket built by United Launch Alliance (ULA), the company responsible for the rockets used to launch the spacecraft into orbit. A subsequent launch date of May 25 was also postponed after a small helium leak was detected in the service module, which contains the support systems and instruments necessary for spacecraft operation.

Further complications arose with additional helium leaks and a thruster issue, which posed potential delays to Starliner’s docking. Even after docking with the ISS, NASA and Boeing reported the spacecraft had five “small” helium leaks, butassured that enough helium remained for the return mission.

To address these concerns, teams at NASA’s White Sands Test Facility in New Mexico conducted ground tests on Starliner’s thrusters, simulating conditions similar to those experienced on the journey to the ISS to assess the spacecraft’s behavior during undocking.

Stich acknowledged that these developments have been challenging for all involved. “The crew has gone through a lot of emotions concerning the changes to the mission and the test flight,” he said. He further reflected on the long-term implications of the changes, noting, “In the ultimate long-term view, we have not lost anything, because Boeing … is committed to finding the solutions and flying Starliner again. But I probably can not express what it’s like in words when you commit to a mission so long and then we make a fairly dramatic change which we have not in human space flight in a long time.”

Norm Knight, NASA’s director of flight operations directorate, also acknowledged the difficulties faced by the families of Wilmore and Williams, who now face a longer wait for their loved ones to return. “I care deeply about their families, I know this is a huge impact on their families and it means a lot,” Knight said. He expressed gratitude for the support of the families, saying, “I tell their families thank you for their support, thank you for what they do.”

Despite the setbacks and changes to their mission, Wilmore and Williams remain committed to their extended stay on the ISS, continuing to support NASA’s objectives in space exploration and research. The decision to bring them back aboard a different spacecraft underscores NASA’s prioritization of safety and thorough assessment in its manned missions. As the space agency continues to evaluate and refine its spacecraft capabilities, the commitment to safety and successful mission outcomes remains paramount.