Earth's Gravity May Have Kept the Early Moon's Volcanic Heart Beating

• The Chang’e-5 mission returned lunar material that was dated to be only two billion years old, yet appeared to be volcanic in origin.
• The material was found to be basalts, which are only formed in active volcanoes or under similar high-pressure and temperature conditions.
• This suggests that the Moon was still geologically active two billion years ago, possibly due to tidal heating.

• The Moon’s orbit was much closer to Earth two billion years ago, leading to significant tidal forces that generated heat.
• A 3D model of the Moon’s mantle showed that tidal forces directed energy specifically at two symmetric regions along the core-mantle boundary.
• These regions absorbed 150 gigawatts of power, more than four times the energy from radioactive decay, which helped maintain the Moon’s internal heat and geology.

• The tidal heating anomaly zones (THAZs) are believed to have sustained the Moon’s geological activity, contributing to the formation of basalts seen in the Chang’e-5 samples.
• The model offers a plausible explanation for the Moon’s volcanic history and the presence of a magnetic field in lunar samples.
• While the theory is still a model, it provides new insights into the Moon’s geological evolution and the role of tidal heating in its history.

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