Uncovering Mars' Secrets: Seismic Waves Reveal Core Differences.

NASA's Mars InSight lander has provided the first direct observations of another planet's core, which scientists now believe is smaller and denser than previously thought. Two Marsquakes recorded in 2021 produced seismic waves that passed right through Mars' core, an event that had never before been captured. The pair of quakes were also the first that InSight detected from the far side of Mars, which made them harder to pick out from the background noise picked up by InSight's seismological instruments, but also ideal for observing the Martian depths.