【新华社】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 crystallized iron-nickel alloy rich in light elements [1][2] - The research utilized seismic data from NASA's InSight lander, analyzing over 23 high signal-to-noise ratio seismic events to extract critical seismic phases that traverse Mars' core [1] Group 1 - Mars' outer core and inner core exhibit a wave speed jump of about 30% and a density difference of approximately 7% [2] - The inner core is not solely composed of iron and nickel; it may also contain sulfur, oxygen, and carbon, providing insights into the evolution of Mars' magnetic field from an active state to its current dormant state [2] Group 2 - This study is the first to confirm the presence of a solid inner core in a planet outside 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 significant reference points for future lunar exploration and the use of seismology to investigate the deep structures of other celestial bodies [2]