NASA mission finds the first seismic waves passing through Mars's core.

NASA's InSight lander collected soundwaves during quakes on Mars and a meteorite impact during the past four years, revealing secrets of the Martian interior. Scientists have used the data to determine that Mars has a liquid iron-alloy core that includes lightweight elements such as sulfur and oxygen, as well as smaller amounts of hydrogen and carbon. This discovery can help scientists learn more about how rocky planets such as Earth and Mars form, how the two planets differ, and the factors that help make other planets habitable for life. Researchers analyzed how long it took seismic waves generated by one marsquake as well as a meteorite impact to travel through the Martian core, allowing them to estimate the core's density and chemical composition.