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更精准丈量太空 我国获得宇宙探索新进展
Yang Shi Wang· 2025-08-17 08:35
Core Points - Chinese scientists successfully detected a laser signal reflected from a 10-centimeter diameter retroreflector on the Moon, marking a significant achievement in space exploration [1][4] - This accomplishment makes China the fourth country to complete such measurements, following France, Germany, and the United States [4] - The new generation of lunar retroreflectors offers higher precision compared to previous models, despite being more challenging to observe due to their smaller size and weaker signals [6][8] Group 1 - The laser echoes were received from a set of retroreflectors installed on the lunar surface, which serve as reference points for measuring distances in space [3] - The measurement process involves sending laser pulses from ground observation stations to the retroreflectors and calculating the time taken for the pulses to return [3] - The difficulty of detecting such a small target from a distance of approximately 380,000 kilometers is likened to finding a grain of sand on an aircraft carrier's deck [8] Group 2 - The "Tianqin Project" aims to continuously collect data from the retroreflectors to accumulate high-precision Earth-Moon distance measurements [10] - This data will be used for research on gravitational forces, the evolution of the Earth-Moon system, and will lay the groundwork for future gravitational wave detection in space [10]
我国科学家首次探测到月球新一代激光反射镜回波信号
Ren Min Ri Bao· 2025-08-14 21:45
据了解,上世纪,美国和苏联在月球上放置了5个可供测月的激光反射器阵列。2019年,"天琴计划"团 队完成了对这5个激光反射镜的测量。今年3月,美国将新一代激光反射镜NGLR—1投放到月球。"此次 成功探测反射镜回波信号,为理解引力、时空、月球内部以及地月系统的演化提供了至关重要的数据, 能够帮助我们更深入地理解宇宙的基本法则。"吴先霖说。 记者从中山大学获悉:8月13日,该校天琴测距台站探测到月球新一代激光反射镜NGLR—1的回波信 号,并确认测距实验成功,这是我国科学家首次探测到该月球激光反射镜。 据介绍,"天琴计划"是中国科学院院士罗俊于2014年提出的空间引力波探测计划,预期于2035年前后, 在约10万公里高的地球轨道上部署3颗卫星,构成边长约17万公里的等边三角形星座,建成空间引力波 天文台,进行基础物理、天体物理及宇宙学的前沿研究。本次成果是"天琴计划"进展的一部分。 8月13日0时37分,中山大学天琴测距台站工程师韩西达、吴先霖带领团队成员探测到新一代月球后向角 反射器NGLR—1的激光回波信号,初步获得17个距离测量值,但实验因天气原因暂停;5时39分,再次 获得NGLR—1的38个距离测量值 ...