Mars’ dense liquid iron core is wrapped in a layer of molten rock, which threw off previous measurements of the Red Planet’s heart.
The Red Planet has a dense core of liquid iron surrounded by a relatively thin layer of molten rock, researchers report. The finding resolves a recent conundrum that came about when seismic measurements on Mars seemed to suggest that the planet had a surprisingly, shows the planet is made of materials common in the solar system at the time Mars formed.
). It measured Marsquakes and reverberations from meteorite impacts on the planet for a little over four years. Seismic waves that bounced off the outer surface of a layer of molten rock and were detected by NASA’s InSight lander initially implied the core is larger and lighter than planetary scientists expected. The reverberations from a meteor impact on Mars led to seismic waves that dipped into the molten rock, revealing the existence of a smaller, denser iron core.
The core has a roughly 10 percent smaller radius and a higher density than previously reported, with one group finding a A better understanding of Mars has implications far beyond the Red Planet. Mars and Earth were very similar when they first formed, says planetary scientist Henri Samuel of CNRS in Paris, and a coauthor of one of the new studies. “However, at some point these two planets diverged and Mars is now not habitable while the Earth is. Therefore, understanding how this divergence has occurred can tell us a lot our own planet.
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