Business Insider

‘InSight can measure the chemical makeup of the soil. But InSight’s drill pulls double duty. As it hammers away, it also sends vibrations through the ground, which are sensitive to different layers that might be hiding under the surface. For example, if Mars has underground lava flows, those vibrations will find them. But this only gives NASA clues to the shallower layers of Mars. To understand the deep inner core, InSight has another tool that will measure how much Mars wobbles on its axis. It works similar to an egg. If you spin an uncooked egg, the liquid yolk will slosh around making the egg wobble. But if the inside is cooked, there’s less wobble. Similarly, how much Mars wobbles can tell us whether its core is molten liquid or solid metal’.
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