Space & Astronomy
Magnetic moon mystery solved
November 11, 2011 | 10 comments
Image Credit: NASA
Why are there magnetised rocks on the lunar surface when the Moon has no magnetic field ?
Two new studies have been published that attempt to solve the mystery. Christina Dwyer and colleagues from the University of California have put forward the idea that the Moon once had a geodynamo due to differences in the way its liquid core rotated in the distant past.
A second theory has been proposed by scientists including Dr Michael Le Bars at the Aix-Marseille Universite in France, who have suggested that early asteroid impacts could have changed the Moon's rotation rate causing tidal distortion at the core-mantle boundary.
Scientists may have solved one of the Moon's enduring mysteries: why there are magnetised rocks on the lunar surface, when the Moon has no global magnetic field.
Source: Australian Broadcasting Corporation
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