The solid inner core (610 km radius) found by Huixing Bi and colleagues is hugely significant. The very presence of a solid inner core shows that crystallization and solidification is taking place as ...

For four years, a lone robot sat on the dusty plains of Mars, listening. The InSight lander, a three-legged marvel of engineering, was sent to take the Red Planet’s pulse. There’s not much happening ...

Mars may have a hardened heart. Marsquake reverberations detected by NASA’s InSight lander revealed that the Red Planet probably possesses a solid inner core, researchers report in the Sept. 4 Nature.