我国科学家发现火星存在固态内核

Core Findings - Chinese scientists have confirmed the existence of a solid inner core on Mars with a radius of approximately 600 kilometers, primarily composed of a nickel-iron alloy rich in light elements [1][2] - The research was published in the journal Nature and involved collaboration between the University of Science and Technology of China and international scholars, utilizing seismic data from NASA's InSight lander [1] Group 1: Research Methodology - The research team employed an innovative seismic array analysis method to analyze data from 23 high signal-to-noise ratio seismic events, successfully extracting key seismic phases that traverse Mars' core [1] - The study highlights the challenges of exploring planetary interiors, noting that the detection of Earth's inner core took decades, while Mars presents even greater difficulties due to weak signals and noise interference [1] Group 2: Findings on Mars' Core Structure - The seismic data indicates a 30% velocity jump and a 7% density difference between Mars' outer and inner cores, suggesting a layered structure with a liquid outer core and a solid inner core [2] - The analysis revealed that Mars' core is not solely composed of iron and nickel but may also contain sulfur, oxygen, and carbon, providing insights into the evolution of Mars' magnetic field [2] Group 3: Implications of the Research - This study is the first to confirm the existence of a solid inner core on a planet other than Earth, supporting the notion of a differentiated core-mantle structure similar to that of Earth [2] - The innovative seismic methodology developed for this research offers important references for future lunar exploration and the study of other celestial bodies' internal structures [2]