Researchers at the University of Oxford analyzed seismic data collected by NASA’s Insight Lander to study a previously unexplained geological boundary located approximately 15 miles beneath Mars’s surface. The investigation utilized seismic waves generated by meteorite impacts and natural Martian earthquakes to examine the nature of this subsurface feature.
The team’s analysis, documented in Nature Astronomy, determined that molten rock pooling in the underground region and extending horizontally for hundreds or thousands of miles represented the most probable explanation for the observed geological boundary. This discovery challenges the conventional understanding of Martian geology, which had assumed that volcanic features were supported by isolated magma chambers rather than an interconnected system.
The presence of such an extensive underground magma network would have created conditions conducive to chemical complexity within the planet’s crust. This complexity would have enabled processes such as element recycling—mechanisms previously thought necessary for the generation of planetary atmospheres and oceans. Additionally, an interconnected magma system could have contributed to climate regulation, a function scientists previously attributed exclusively to planets with plate tectonics.
The findings have broader implications for planetary science. Rocky worlds that lack plate tectonics have generally been considered less likely to support life and were excluded from habitability assessments. The research suggests these planets warrant reconsideration as potentially habitable environments, thereby expanding the universe of worlds that may have once harbored conditions suitable for biological activity.
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