According to Bart Root, the lead author of the study, 'There seems to be no trace of them at the surface...a tantalizing glimpse into the older history of the northern hemisphere of Mars.'
The structures identified are about 300 to 400 kilograms per cubic meter denser than their surroundings, which could indicate volcanic activity or compaction from ancient meteor strikes.
The analysis presented at the Europlanetary Science Congress reveals that Mars may not be as geologically inactive as previously believed, challenging assumptions about the planet.
The satellite orbits combined with seismic data from NASA's InSIGHT lander uncovered dense structures that suggest the Martian mantle might still host active geological processes.
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