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Scientists have confirmed that Mars has a solid inner core, similar to Earth’s, based on seismic data from NASA’s InSight lander, which detected over 1,300 marsquakes before shutting down in 2022. The study, published in Nature, shows the Martian inner core extends about 380 miles (613 km) from the planet’s center, made mostly of iron and nickel, with lighter elements such as oxygen likely present. This solid core is surrounded by a molten metal outer core, overturning earlier theories of a fully liquid Martian core.
Wednesday, 3 September, 2025