(260910) -- BEIJING, Sept. 10, 2026 (Xinhua) -- Students attend a live space lecture of the 'Tiangong Class' Hong Kong and Macao Designated Session in Hong Kong, south China, Sept. 9, 2026. The event was held simultaneously in Hong Kong and Macao on Wednesday morning, as the three Chinese astronauts of the Shenzhou-23 crew currently carrying out a manned space mission at the Tiangong space station delivered a live space lecture for students. (Photo by Lui Sui Wai/Xinhua)