A Long-Lived Lunar Core Dynamo

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Science  27 Jan 2012:
Vol. 335, Issue 6067, pp. 453-456
DOI: 10.1126/science.1215359

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Magnetic Moon

It has long been suspected that the Moon once had a core-dynamo magnetic field. Shea et al. (p. 453) describe a lunar basalt brought back by Apollo 11 that records evidence for a strong dynamo on the Moon 3.7 billion years ago. This study, together with a previous study of different lunar rock, implies that a lunar core dynamo existed between 4.2 and 3.7 billion years ago, which extends the known lifetime of the lunar dynamo by 500 million years.