Titanium-rich rocks are the reason behind Moon’s magnetic mystery—Here's what scientists found!

Titanium rocks hold the mystery behind Moon's magnetic field. (Image: Canva)

• Titanium-rich Moon rocks recorded stronger ancient magnetism.
• Moon's magnetic field was episodic, not long-lasting like Earth's.
• Apollo rock anomalies solved, new questions arise.

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For decades, scientists have been scratching their heads over a puzzling discovery from the Apollo missions. Some Moon rocks carry evidence of an ancient magnetic field that was as strong or even stronger than Earth’s. But the Moon today barely has a magnetic field at all. How could this be? Scientists solved the mystery behind the magnetic field of Moon rocks.

The Curious Case of Magnetized Moon Rocks

Apollo astronauts brought back mare basalts, volcanic rocks from the Moon’s surface, that were mysteriously magnetised. Some of these rocks hints that the Moon once had a field as strong as 100 microteslas.

This is comparable to Earth’s average surface field of ~50 microteslas. Scientists wondered and raised question on Moon's strong and long-lasting magnetic field. They also studied about the magnetic field and anomalies if Moon had both.

Titanium Holds the Key

New research by Oxford University scientists shows that the titanium content in the rocks plays a major role. Rocks rich in titanium seem to have recorded much stronger ancient magnetism, while low-titanium rocks remained weakly magnetised. This discovery suggested that previous measurements might have been skewed by the types of rocks collected.

A Temporary Magnetic Dynamo

The researchers propose a fascinating solution with help of computer models. The episodic bursts of strong magnetism caused by the melting of titanium-rich material deep inside the Moon, near the core–mantle boundary.

The short events may increase the heat outflow of the core, which would temporarily drive a stronger magnetic field. Basically, the magnetic field of the Moon was not constant but it resembled a cosmic lighthouse.

What This Means for Lunar History?

The Moon probably did not have a long-term, earth-like magnetic field but instead had brief bursts of magnetism, which lasted several thousand years. The studies of the Apollo rocks by the scientists were fortunate to occur in the region of these spikes thus, creating an illusion of a field that is always very strong.

Debunking the Long-Held Mystery

Science for a long time has indicated that the magnetic field of the Moon was very strong in the past decades. The assumption is disproved in this new investigation and it is revealed that the Moon was predominantly loosely magnetized, intermittently so intensely that it left a permanent mark on rocks.

Next Steps for Lunar Science

The discovery not only solve the magnetic anomalies in Apollo rocks but also presents new questions concerning the ways small planetary bodies produce and dissipate magnetic fields.

This theory may be further verified by future missions to the moon through the study of rocks at various locations in terms of their titanium composition and magnetic past.