This undated photo taken by Shenzhou-17 crew member Tang Hongbo from China's space station shows a view of the earth. [Photo/Xinhua] This undated photo taken by Shenzhou-17 crew member Tang Hongbo from China's space station shows a view of the earth. [Photo/Xinhua] This undated photo taken by Shenzhou-17 crew member Tang Hongbo from China's space station shows a view of the earth. [Photo/Xinhua] This undated photo taken by Shenzhou-17 crew member Tang Hongbo from China's space station shows a view of the earth. [Photo/Xinhua] This undated photo taken by Shenzhou-17 crew member Tang Shengjie from China's space station shows a view of the earth. [Photo/Xinhua] This undated photo taken by Shenzhou-17 crew member Tang Hongbo from China's space station shows a view of the earth. [Photo/Xinhua] This undated photo taken by Shenzhou-17 crew member Tang Hongbo from China's space station shows a view of the earth. [Photo/Xinhua] This undated photo taken by Shenzhou-17 crew member Tang Shengjie from China's space station shows a view of the cosmos. [Photo/Xinhua] This undated photo taken by Shenzhou-17 crew member Tang Shengjie from China's space station shows a view of the cosmos. [Photo/Xinhua] This undated photo taken by Shenzhou-17 crew member Tang Shengjie from China's space station shows a view of the cosmos. [Photo/Xinhua] This undated photo taken by Shenzhou-17 crew member Tang Shengjie from China's space station shows a view of the cosmos. [Photo/Xinhua]