Updated

Updated · The Economic Times · Jul 10

Scientists Find Tidally Locked Planets Could Harbor Life in Mid-Latitude Warm Zones

Updated

Updated · The Economic Times · Jul 10

Scientists Find Tidally Locked Planets Could Harbor Life in Mid-Latitude Warm Zones

Q: Venus has a hot interior but no magnetic shield. What is the true key to a planet's survival: internal heat or a protective field?

A protective magnetic field is the more decisive factor for long-term planetary survival, while internal heat matters mainly because it can help generate that shield. The new tidally locked-planet research is important because it shows internal heat can do more than warm a planet from below. The lab results suggest steady mantle circulation could create subsurface habitable zones and may also help stir a molten core, a possible route to producing a magnetic field. That means internal heat can support habitability both directly, through underground warmth, and indirectly, through dynamo action. But Venus shows the limit of heat alone. It still has a hot interior and signs of geological activity, yet it lacks a strong intrinsic magnetic field. Without that protection, the solar wind can interact more deeply with the upper atmosphere, contributing to the long-term loss of hydrogen and oxygen and helping dry the planet out. Venus’s history also shows that internal activity can become harmful if it feeds a runaway greenhouse through volcanic CO2 release and weak climate regulation. So the real answer is not heat versus field in isolation. Internal heat is necessary for a dynamic planet, but a magnetic field is the more direct safeguard for keeping an atmosphere and water under stellar bombardment. For habitability, the best combination is active interior circulation, a sustained magnetic dynamo, and an atmosphere stable enough to avoid a Venus-like greenhouse collapse.

3 articles · Updated · The Economic Times · Jul 10

Tank experiments showed heat transport on tidally locked planets can resemble Earth's mantle, pointing to stable underground warm zones despite permanent day on one side and night on the other.
Those pockets would likely form in mid-latitudes, where slow internal circulation could keep subsurface conditions temperate even as the surface swings between extreme heat and deep freeze.
The same circulation may also help churn a molten core and generate a magnetic field, which could shield an atmosphere from stellar radiation, though that part remains untested.
Researchers at Penn, JAMSTEC and Hokkaido University, writing in Nature Communications, are planning follow-up lab work to test the magnetic-field idea and refine how heat moves through such worlds.

Sources

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Subsurface Habitability on Tidally Locked Exoplanets: New Evidence from LHS 3844b and the Expanding Search for Life Beyond the Goldilocks Zone

Overview

Recent research in July 2026 has challenged the old belief that tidally locked exoplanets, with one side always facing their star and the other in darkness, are too extreme for life. Scientists focused on LHS 3844b, a planet with harsh surface conditions, and discovered that life might still be possible underground. Laboratory simulations showed that internal heat can circulate beneath the surface, creating stable, warm zones where life could survive. This breakthrough suggests that even planets with extreme surface temperatures might have hidden, habitable environments below ground, opening new possibilities in the search for extraterrestrial life.

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