(250929) -- SYDNEY, Sept. 29, 2025 (Xinhua) -- Clay Mowry, President of the International Astronautical Federation (IAF), addresses the opening ceremony of the 76th International Astronautical Congress (IAC 2025) in Sydney, Australia, Sept. 29, 2025. The 76th International Astronautical Congress (IAC 2025) opened in Sydney on Monday, gathering thousands of space professionals, decision-makers, academics, industry leaders, astronauts, and students from around the world. (Xinhua/Li Xiaoyu)