A pair of US astronauts stuck for more than nine months on the International Space Station (ISS) will be returned to Earth on Tuesday evening, Nasa said. Butch Wilmore and Suni Williams are to be transported home with another American astronaut and a Russian cosmonaut aboard a SpaceX Crew Dragon craft after a replacement crew arrived at the ISS early on Sunday. The stranded duo have been on the ISS since June after the Boeing Starliner spacecraft they were testing on its maiden crewed voyage suffered propulsion issues and was deemed unfit to fly them back to Earth. Nasa said in a statement on Sunday evening that it had moved forward the astronauts’ anticipated ocean splashdown off the Florida coast to approximately 5:57pm on Tuesday. It was initially slated for no sooner than Wednesday. “The updated return target continues to allow the space station crew members time to complete handover duties while providing operational flexibility ahead of less favourable weather conditions expected for later in the week,” the space agency said. Nasa astronaut Nick Hague and Roscosmos cosmonaut Aleksandr Gorbunov will also return on the Dragon capsule, with the journey to be broadcast live from Monday evening when hatch closure preparations begin. For Wilmore and Williams, it will mark the end of an ordeal that has seen them stuck for nine months after what was meant to have been a days-long roundtrip.