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It happens on Earth too.

Yes it does and it hasn't happened during recorded history so no one really knows what happens during a geomagnetic reversal.

These periods are called chrons. The time spans of chrons are randomly distributed with most being between 0.1 and 1 million years[citation needed] with an average of 450,000 years. Most reversals are estimated to take between 1,000 and 10,000 years. The latest one, the Brunhes–Matuyama reversal, occurred 780,000 years ago. However,a study published in 2012 by a group from the German Research Center for Geosciences suggests that a brief complete reversal occurred only 41,000 years ago during the last glacial period. The reversal lasted only about 440 years with the actual change of polarity lasting around 250 years.

Al Gore's concerned... he wants US taxes raised and money sent to corrupt African leaders who will then 'kickback' cash to special creepy UN guys... If we don't do this soon, we're all gonna die...