A worsening air leak aboard the International Space Station prompted five astronauts to take shelter and prepare for evacuation for roughly two hours on Friday as Russia attempted to fix a crack on its portion of the orbital laboratory, Nasa said. The four astronauts of Nasa’s Crew-12 mission aboard the station – two Americans, a French astronaut and a Russian cosmonaut – along with another US astronaut were ordered by Nasa mission control at 9.04am on Friday to enter their SpaceX-built Crew...