Ouyang Ziyuan (simplified Chinese: 欧阳自远; traditional Chinese: 歐陽自遠; pinyin: Ōuyáng Zìyuǎn, born 1935) is a Chinese cosmochemist, geochemist and space advocate. He is a research professor at the Institute of Geochemistry of the Chinese Academy of Sciences.
Ouyang was born in 1935 in Ji'an, Jiangxi. He obtained a degree in geology and a doctorate in mineral deposits and geochemistry, and spent many years conducting studies in deep mines. He later studied nuclear physics and worked in a particle accelerator laboratory. He later put forward a hypothesis of the formation of iron meteorites, an evolutionary model of the formation of the meteorites which fell at Jilin in 1976, and a theory of multi-stage cosmic ray radiation history. His works include Celestial Chemistry, and he has published more than 160 scientific treatises. He was elected a Member of the Chinese Academy of Sciences in 1991.
As an expert in geological research on underground nuclear tests and extraterrestrial materials, Ouyang was among the first to advocate not only the exploitation of lunar reserves of metals such as iron, but also the mining of lunar helium-3, an ideal fuel for nuclear fusion power plants. Ouyang is now the chief scientist of the Chinese Lunar Exploration Program (CLEP), also known as the Chang'e program. He is the most prominent supporter of the Chinese manned lunar exploration program, and also lobbies for the Chinese exploration of Mars.
On November 12, 2008, upon China's publication of a comprehensive lunar surface map, Ouyang encouraged all three Asian nations then involved in lunar exploration (China, India and Japan) to increase co-operation in furthering humanity's understanding of the Moon.