Naked Science Season 5 Episode 11
Episode Title: Earth's Invisible Shield
Countries:
USA,
Airing Date: September 18, 2008
Runtime:60 mins
IMDb Rating:
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Naked Science: 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.