The far side of the Moon provides clues to a previous magnetic field
The result: in the Dewar region, beneath the lunar surface, lies a rock body approximately 60 kilometres wide, extending to a depth of around 9 kilometres. It is much denser than the surrounding crust, while strongly magnetised at the same time. Combined with the surface geochemistry and an arched topography, the researchers conclude that this is solidified magma that has risen from the subsurface – a buried volcanic complex.
- ▪The result: in the Dewar region, beneath the lunar surface, lies a rock body approximately 60 kilometres wide, extending to a depth of around 9 kilometres.
- ▪It is much denser than the surrounding crust, while strongly magnetised at the same time.
- ▪Combined with the surface geochemistry and an arched topography, the researchers conclude that this is solidified magma that has risen from the subsurface – a buried volcanic complex.
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| Original publisher | ETH Zurich |
| Canonical URL | https://ethz.ch/en/news-and-events/eth-news/news/2026/09/the-far-side-of-the-moon-provides-clues-to-a-previous-magnetic-field.html |
| Publication time | Sat, 26 Sep 2026 07:49:50 +0000 |
| Retrieval time | 2026-09-26T10:36:00.198Z |
| Last seen | 2026-09-26T10:36:00.198Z |
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Opening excerpt (first ~120 words) tap to expand
The result: in the Dewar region, beneath the lunar surface, lies a rock body approximately 60 kilometres wide, extending to a depth of around 9 kilometres. It is much denser than the surrounding crust, while strongly magnetised at the same time. Combined with the surface geochemistry and an arched topography, the researchers conclude that this is solidified magma that has risen from the subsurface – a buried volcanic complex. The age of the structure – 4.2 billion years – can be determined from the various deposits of impact material on the lunar surface. A surprisingly strong magnetic field “Because we know how much iron is present in such a rock body, we can estimate the minimum strength the magnetic field must have had as the magma cooled slowly.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at ETH Zurich.
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