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InSight, Based On Mars Quake Data, Has Provided The Best Glimpse Of Mars Interior, Indicating The Core Comprises Liquid Nickel-Iron, And Is Larger Than Previously Thought, 2,230–2320 Miles Wide, And Probably Less Dense. While The Lithosphere, With Thicker Crust, Is Similar But ~ 56 Miles Thicker Than Earth’s, And Lacks Tectonic Plates.

We just got our best-ever look at the inside of Mars | MIT Technology Review

https://www.technologyreview.com/2021/07/23/1030040/we-just-got-our-best-ever-look-at-the-inside-of-mars/

NASA’s InSight lander has shown the planet’s interior is more complex than previously thought.