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Earth's magnetic shield is much older than previously though
http://www.epgeology.com/news-f37/earth-magnetic-shield-much-older-than-previously-though-t9387.html
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Author:  NewsPoster [ Mon Aug 03, 2015 6:44 pm ]
Post subject:  Earth's magnetic shield is much older than previously though

Science Daily Geology

Since 2010, the best estimate of the age of Earth's magnetic field has been 3.45 billion years. But now a researcher responsible for that finding has new data showing the magnetic field is far older.

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