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If Earth is so old, doesn that mean Earths decaying magnetic field would have been unacceptably high at one time?

April 26, 2017decaying earth high magnetic field mean time unacceptably

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If Earth is so old, doesn that mean Earths decaying magnetic field would have been unacceptably high at one time?

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No. The Earth’s magnetic field is known to have varied in intensity and reversed in polarity numerous times throughout the planet’s history. See the Alleged Decay of the Earth’s Magnetic Field FAQ.