Mars' core looks bigger than it is because it's wrapped in radioactive magma

Data from a meteorite impact on Mars that was recorded by NASA's InSight lander in 2021 is now helping to clear up some confusion about the red planet's interior makeup. A pair of studies published today in the journal Nature separately determined that Mars' iron-rich core is smaller and denser than previous measurements suggested, and it's surrounded by molten rock. The now defunct InSight lander, which arrived on Mars in November 2018, spent four years recording seismic waves produced by marsq...