We found the core of Mars!

Earth's core was found 115 years ago from the observation of very distant quakes. Using InSight's observations, we could repeat this analysis on Mars and confirm that the planet has a core: A surprisingly large one.

Khan A et al.: Upper mantle structure of Mars from InSight seismic data. Science, 373, (6553) p. 434-​438. doi: 10.1126/science.abf2966

Stähler S et al.: Seismic detection of the Martian core. Science, 373, (6553) p. 443-​448. doi: 10.1126/science.abi7730

Knapmeyer-​Endrun B et al.: Thickness and structure of the Martian crust from InSight seismic data. Science, 373, (6553) p. 438-​443. doi: 10.1126/science.abf8966

Free PDFs of all 3 papers can be found night