Nasa has reported an additional postponement in the Boeing Starliner’s journey back to Earth from the International Space Station, along with its first crew of astronauts. On Friday, the agency stated that additional time is required to evaluate the technical problems faced during the mission. The return date remains undetermined, creating ambiguity about when the two astronauts, Butch Wilmore and Sunita Williams, will conclude their voyage on Boeing’s inaugural crewed mission.