Two astronauts stuck in space may not be able to return to Earth until 2025 due to issues with Boeing’s new Starliner capsule, US space agency NASA said on Wednesday. The two crew members of the Starliner, US astronauts Barry Wilmore and Sunita Williams, have now been on the ISS since June, although they were only supposed to stay one week. After launching from the Cape Canaveral space centre in Florida, the spacecraft was only able to dock with the ISS on a second attempt due to engine problems. In addition, the spacecraft suffered a helium leak. Two options to return the astronauts to Earth …