China's pioneering primordial gravitational wave detection experiment, AliCPT-1, has reached a significant milestone. Completed at an elevation of 5,250 meters in Tibet's Ngari Prefecture, the project has successfully achieved first light observation, capturing crisp images of the Moon and Jupiter at a frequency band of 150GHz. Spearheaded by the Institute of High Energy Physics of the Chinese Academy of Sciences, AliCPT-1 signifies a pivotal advancement in China's pursuit of primordial gravitational wave detection. The detection of these waves is a vital experiment aimed at validating theories about the universe's origins, and the successful completion of AliCPT-1 has firmly established a foundation for China's continued research in this groundbreaking field.