This screen image captured at Beijing Aerospace Control Center on Dec. 17, 2024 shows Shenzhou-19 astronaut Cai Xuzhe (above) and Song Lingdong (below) working outside and inside the airlock cabin of China's orbiting space station. (Xinhua/Li Jie)

This screen image captured at Beijing Aerospace Control Center on Dec. 17, 2024 shows Shenzhou-19 astronauts preparing for extravehicular activities. (Xinhua/Li Jie)

This screen image captured at Beijing Aerospace Control Center on Dec. 17, 2024 shows Shenzhou-19 astronaut Song Lingdong performing extravehicular activities outside China's orbiting space station. (Xinhua/Li Jie)

This screen image captured at Beijing Aerospace Control Center on Dec. 17, 2024 shows Shenzhou-19 astronaut Cai Xuzhe performing extravehicular activities outside China's orbiting space station. (Xinhua/Li Jie)

This screen image captured at Beijing Aerospace Control Center on Dec. 17, 2024 shows Shenzhou-19 astronaut Song Lingdong waving his hand during extravehicular activities outside China's orbiting space station. (Xinhua/Li Jie)

This screen image captured at Beijing Aerospace Control Center on Dec. 17, 2024 shows Shenzhou-19 astronaut Cai Xuzhe leaving China's orbiting space station for extravehicular activities. (Xinhua/Li Jie)