Two Chinese astronauts took four-hour spacewalk outside the country’s growing Tiangong station this weekend to work on its newest laboratory module, according to state media reports. Astronauts Chen Dong and Cai Xuzhe of the China National Space Administration began their spacewalk Saturday (Sept. 17) at 1:35 a.m. EDT (0535 GMT or 1:35 p.m. Beijing time) outside the Tiangong space station and spent 4 hours and 12 minutes working on its new Wentian laboratory module, according to the state-run CCTV news channel (opens in new tab). “With the aid of the small mechanical arm, astronauts Cai and Chen conducted a series...