Space and astronomy news
An artist's depiction of the liquid silicate layer wrapped around the Martian core. Credit: IPGP-CNES.
It has long been believed that Mars once had a global magnetic field like Earth does, but somehow the iron-core dynamo that generated it must have shut down billions of years ago. “The blanket not only insulates the heat coming from the core and prevents the core from cooling, but also concentrates radioactive elements whose decay generates heat,” said Vedran Lekic, a professor at the University of Maryland and co-author of a“And when that happens, the core is likely to be unable to produce the convective motions that would create a magnetic field—which can explain why Mars currently doesn’t have an active magnetic field around it.
Without the protection a magnetic field provided, Mars’ atmosphere was stripped, and eventually, any water on the surface – even oceans – would have evaporated as water vapor in the atmosphere was lost to space, making it incapable of sustaining life.NASA’s InSight mission deployed the first seismometer on the surface of Mars.
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