NASA astronauts Butch Wilmore and Suni Williams will remain aboard the International Space Station (ISS) longer than planned due to problems with their Boeing Starliner capsule. Their return, which was originally scheduled for mid-June, has been delayed due to malfunctions, including thruster failures and helium leaks. No new return date has been established yet, according to NASA’s commercial crew program manager, Steve Stich. The primary objective is to bring the astronauts back on the Starliner once these issues are resolved, although alternative options such as SpaceX’s Dragon capsule are being considered.

Engineers have recently tested a spare thruster and will continue to investigate the causes of the malfunctions that occurred on June 6 during the Starliner’s approach to the ISS. Preliminary findings suggest that degraded seals might be responsible for the helium leaks and thruster problems, but additional data is needed. Boeing intends to test-fire the thrusters while the capsule remains docked to the space station. This mission represents Boeing’s first crewed test flight, following an uncrewed test in 2019 that failed to reach the ISS due to software issues, and another test in 2022 with additional complications. SpaceX, which has been transporting astronauts since 2020, is also dealing with issues of its own, as its Falcon 9 rockets are currently grounded due to an upper-stage failure. NASA’s investment in private companies like Boeing and SpaceX, amounting to billions of dollars, aims to ensure reliable transportation for astronauts to the ISS.