Studies of ‘Marsquakes’ reveal the red planet’s metallic innards

We may have walked on the Moon and sent probes across the solar system, but we know very little about what’s going on inside other planets. Now, for the first time, we have been able to view the interior of one, thanks to NASA’s Mars InSight probe. The probe, which landed in 2018, is equipped with a solar-powered lander bristling with equipment, including a seismometer (a very sensitive vibration detector). The results, published in three studies in Science, throw up some unexpected findings about Mars’s interior, including a very large core. Though Mars has no tectonic plates, the first “marsquakes”…

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