Answer: China
Notes: China has successfully demonstrated artificial photosynthesis in space, with their astronauts on the Tiangong space station producing oxygen and rocket fuel using this technology. The astronauts used a process mimicking natural photosynthesis to convert carbon dioxide and water into oxygen and rocket fuel components using solar energy. The experiment was conducted on China's Tiangong space station. This breakthrough is considered a major step forward in space exploration, as it could enable future missions to generate necessary resources in space.
