Scientists believe the dynamo ceased after the core fully crystallized.
Earth has a magnetic field that protects the planet from the stream of charged particles coming from the sun. It is thought to be generated by electric currents that are produced by the movement of liquid metal at the planet's core.
Initially, the moon was far closer to Earth than it is today. Over time it drifted away and it is still moving away from us now, at a rate of about one inch per year. Initially, it had a strong magnetic field, but this was eventually lost.In previous research, the team found that four billion years ago, the moon's magnetic field was around 100 microteslas—about double the strength of Earth's today.
The full moon in December, 2019. Researchers say the moon's internal dynamo ceased between 1.5 and one billion years ago.In 2017, Weiss and colleagues found evidence to suggest that by 2.5 billion years ago, the magnetic field had dropped to about 10 microteslas., they have now identified rocks from the lunar surface that were melted by a large impact about one billion years ago.
Findings suggest the magnetic field may have been powered by two different processes. Initially, the strong field was the result of its proximity to Earth. Being so close, gravitational forces may have stirred up the liquid in the moon's core, producing the dynamo.
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