A lunar magnetic field may not have just been short-lived; it may have persisted for only a blip in geologic time, a new study finds.
Shortly after the moon formed about 4.5 billion years ago, it may have begun generating a magnetic field, a protective sheath that can deflect away charged particles from the sun (SN: 1/11/17). Now, analyses of moon rocks suggest that any lunar magnetic field was gone by at least 4 billion years ago, researchers report August 4 in Science Advances.
Magnetized lunar rocks brought back by Apollo astronauts decades ago were the first indication that the moon may have once had an internal dynamo, in
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