Home / Series / Naked Science / Aired Order / Season 2008 / Episode 15

Earth's Invisible Shield

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.

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  • Originally Aired September 18, 2008
  • Runtime 60 minutes
  • Content Rating United States of America TV-G
  • Network National Geographic
  • Created July 2, 2014 by
    Administrator admin
  • Modified July 2, 2014 by
    Administrator admin