Chinese astronauts successfully performed the country's first tandem spacewalk yesterday, working for seven hours on the outside of the new Tiangong station in orbit around Earth. Three astronauts blasted off last month to become the station's first crew, where they are to remain for three months. Yesterday morning, two of them exited the station for tasks which involved elevating a panoramic camera outside the Tianhe core module, as well as testing the station's robotic arm which will be used to transfer future modules around the station, state media said.