Why were Wilmore and Williams stranded on the ISS for nine months?

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Wilmore and Williams Were Stranded on the ISS Due to Issues with the Boeing Starliner Spacecraft

Astronauts Butch Wilmore and Suni Williams were stranded aboard the International Space Station (ISS) for over nine months because the Boeing Starliner spacecraft, intended for their return journey during its maiden crewed test flight, experienced propulsion problems. These issues rendered the Starliner unfit to safely transport them back to Earth, leading to their extended stay.
Starliner Propulsion Issues Prevented Return

The primary reason for Wilmore and Williams' prolonged mission was the discovery of propulsion issues with the Boeing Starliner spacecraft. Following its test flight, the Starliner was deemed unsuitable for carrying the astronauts back, necessitating a delay in their departure from the ISS. This unexpected situation left them aboard the orbital outpost significantly longer than the typical astronaut rotation.
Empty Return of Starliner Underscored the Problem

The Starliner spacecraft eventually returned to Earth empty, highlighting the severity of the issues that prevented Wilmore and Williams from using it for their return. This meant that the mission, initially planned as a brief roundtrip, turned into an extended stay of approximately nine months for the two NASA astronauts. Their situation garnered global attention due to the unexpected nature of the extended deployment.
Extended Stay Exceeded Standard Rotations

Wilmore and Williams' nine-month stay on the ISS was considerably longer than the standard astronaut rotation, which typically lasts around six months. While their mission duration did not break existing space records, such as the 371 days set by NASA astronaut Frank Rubio, the circumstances of their extended stay, including the need for additional supplies, captured public interest.
Replacement Crew Arrival Paved the Way for Departure

The arrival of a replacement crew, the Crew-10 team, aboard a SpaceX Crew Dragon capsule marked a significant step towards Wilmore and Williams' return. This new crew, comprising NASA astronauts Anne McClain and Nichole Ayers, Japan’s Takuya Onishi, and Russia’s Kirill Peskov, docked with the ISS on Sunday, March 16. Wilmore and Williams are now preparing to depart, with their splashdown off the Florida coast scheduled no earlier than March 19, aboard the returning Dragon capsule alongside NASA astronaut Nick Hague and Russian cosmonaut Aleksandr Gorbunov.

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Why were Wilmore and Williams stranded on the ISS for nine months?

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