National Geographic Channel Naked Science

Season 5 Episode 11

Earth's Invisible Shield

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Aired Thursday 8:00 PM Sep 18, 2008 on National Geographic
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Earth's Invisible Shield
AIRED:
Since the formation of the planet, Earth's magnetic field has shifted poles thousands of times. The last time it happened, humans weren't around. Now with the field weakening, scientists believe another flip is near. Soon, several satellites will be launched with magnetometers to detect even subtle changes, helping experts predict when the field may reverse.moreless

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