Handing over the keys: China's Shenzhou XIX crew handed over the keys of the Tiangong space station to the Shenzhou XX crew in a ceremony on April 27 before returning to Earth. Shenzhou XX was launched on April 24. Its three astronauts entered Tiangong the next day and are set to stay there for about six months. They will perform a range of tasks, including testing equipment, carrying out spacewalks and managing cargo (货物). Notably, the team will be the first Chinese crew to conduct an in-space study on planarians (涡虫), creatures known for their ability to regrow organs.