It turns out Mars has a solid core just like Earth. A Chinese-led research team reported Wednesday that the heart of Mars, while small, is indeed solid. The scientists based their findings on seismic readings from NASA’s InSight lander on Mars, which recorded more than 1,300 marsquakes before shutting down in 2022. Previous studies pointed to liquid at the center of Mars. The solid innermost core is likely composed of iron and nickel, the same ingredients as Earth’s, but quite possibly also enriched with lighter elements like oxygen. The latest study appeared in the journal Nature.