The Shenzhou-20 crew has carried out its first experiment on planarian regeneration aboard China's space station. Planarians, flatworms with an evolutionary history of over 520 million years, are one of the widely used experimental animal models in biological research. Researchers aim to explore how the space environment affects planarian regeneration and physiological behavior. Inside the Wentian laboratory module, the Shenzhou-20 crew observed samples in the biotechnology experiment cabinet an