Seismic waves generated by a meteorite impact on the other side of Mars from where NASA's InSight lander sits have provided new clues about the Red Planet's deep interior, prompting scientists to reappraise the anatomy of Earth's planetary neighbour.
The new seismic data indicates the presence of a hitherto unknown layer of molten rock surrounding a liquid metallic core - the planet's innermost component - that is smaller and denser than previously estimated, researchers said on Wednesday.
Waves generated by quakes - including those caused by meteorite impacts - vary in speed and shape when journeying through different materials inside a planet. Data from InSight's seismometer instrument has enabled the planet's internal structure to come into focus.
