The far side of the Moon provides clues to a previous magnetic field
Peer-Reviewed Publication
Updates every hour. Last Updated: 20-Oct-2026 18:16 ET (20-Oct-2026 22:16 GMT/UTC)
Rock samples from the Moon paint a contradictory picture: some point to a strong, ancient magnetic field, while others do not. Researchers at ETH Zurich used gravity and magnetic field measurements from a specific region on the far side of the Moon to determine the structure and magnetisation of the lunar crust beneath the surface there. Based on these findings, the researchers conclude that 4.2 billion years ago the Moon had a magnetic field stronger than ten microtesla, which corresponds to between one-fifth and one-third of the current strength of the Earth’s magnetic field.
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