Researchers Discovered Thermal Anomaly Inside Martian Mantle
A massive temperature gap between the planet's hemispheres suggests internal heat remains unevenly distributed.
Updated on Sept. 28, 2026 in Geology
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Scientists have identified a significant thermal asymmetry within the Martian mantle, where the southern region is 200 to 400 degrees Celsius warmer than the north. This finding, published in Nature, challenges existing models of the planet's internal heat distribution.
Why it matters
Understanding this internal heat variance provides critical insight into the geological evolution of Mars, including its long-term volcanic activity and crustal history. The research suggests that current planetary models may need revision to account for this localized, non-uniform cooling.
Data from 16 years of gravitational tracking revealed a 200 to 400 degrees Celsius temperature difference between the southern and northern mantle. This discrepancy aligns with seismic data from the InSight mission, which showed faster energy loss in the southern highlands.
The players
NASA
The United States space agency that manages the fleet of orbiters and landers responsible for collecting Martian gravitational and seismic telemetry.
InSight
A retired NASA lander mission that provided the seismic wave data used to correlate mantle temperature differences with internal energy loss.
The details
Researchers utilized tidal tomography, a method of probing internal structure by measuring how solar tides deform a planet, to map internal heat. By tracking minute speed changes in orbiting spacecraft caused by mass shifts, they identified how the gravitational field deviates from standard models. This process mirrors methods used to study thermal asymmetry inside the Moon, which similarly exhibits a 100-to-200-kelvin variation in its interior.
Timeline
16 years of orbital data were analyzed to track gravitational variations.
The findings were published in the journal Nature in September 2026.
The Tech Race
This study advances the use of tidal tomography as a primary method for planetary geology, effectively replacing the need for traditional seismometers on every target. It sets a new benchmark for interpreting interior thermal states by scaling techniques previously perfected during lunar exploration.
This research clarifies the geological history of the Martian surface, specifically the transition after crustal recycling ended 3.5 billion years ago. Future planetary missions will likely prioritize these gravitational mapping techniques to identify potential mantle plumes in regions like Elysium Planitia.
The takeaway
The study demonstrates that Mars is geologically more complex than a cooling, static rock. Observers should track future mission proposals that utilize this tidal tomography approach to investigate volcanic sites like Cerberus Fossae.
Further reading
For more information on the current understanding of planetary interior structures, visit Geology.
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