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Originally Posted by Infinite_Loser
Earth's magnetic field is weakening, that's true. Ehhh... I'm not a scientist, but I remember that Earth's magnetic field reverses every couple of thousand years (I don't really remember the number).
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A little longer than that.
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the Earth's magnetic field reverses at intervals, ranging from tens of thousands to many millions of years, with an average interval of approximately 250,000 years. The last such event, called the Brunhes-Matuyama reversal, occurred some 780,000 years ago.
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Also,
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Some speculate that a greatly diminished magnetic field during a reversal period will expose the surface of the earth to a substantial and potentially damaging increase in cosmic radiation. However, Homo erectus and their ancestors certainly survived many previous reversals. There is no uncontested evidence that a magnetic field reversal has ever caused any biological extinctions.
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Hey, the Wiki shouldn't be a primary resource tool, but I'll trust it enough for something like this.