The heart of Mars passed through a stethoscope

DECRYPTION – The first seismometer deposited on the surface of the red planet revealed the presence of a large liquid nucleus.

Mars finally reveals its entrails to us. The few spasms still shaking the planet have enabled the American probe InSight, launched in 2018, to characterize its internal structure for the first time. The Seis seismometer, of French design, in fact recorded the first Martian tremors shortly after the arrival of the mission. The data has since accumulated and allowed seismologists to produce initial results on how the interior of Mars is made up. “This mission allows us today to know as much about the bowels of Mars as the first geologists knew in 1915 about the bowels of the Earth”, compares Philippe Lognonné, seismologist at the Paris Institute of Globe Physics and the University of Paris, considered to be the father of the Martian seismometer. “In 1915, these discoveries laid the foundations of our geological knowledge. The feat is all the more impressive as these results were provided by a single seismometer,

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