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Earth's Invisible Shield

National Geographic Channel Naked Science: Season 5: Episode 11

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Earth's Invisible Shield

Episode Details & Credits

National Geographic Channel | National Geographic | Air Date: September 18, 2008

Starring: Eric Meyers, Chuck Klausmeyer, Chris Broyles

Summary: 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 whenSince 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.… Expand

Genre(s): Documentary, Science

Season 5 Episodes

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S5:E17. What Killed the Aztecs?
Air Date: November 13, 2008
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S5:E16. Death of the Universe
Air Date: October 16, 2008
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S5:E15. Giant Crystal Cave
Air Date: October 12, 2008

See all Seasons and Episodes

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Seasons & Episodes

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Series Overview
Season 9

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- Season 9 Overview
  Air Date: September 1, 2004
Season 8

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- Season 8 Overview
  Air Date: January 13, 2011
Season 7

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- Season 7 Overview
  Air Date: January 28, 2010
Season 6

tbd
- Season 6 Overview
  Air Date: February 5, 2009
Season 5

tbd
- Season 5 Overview
  Air Date: February 11, 2008
- tbd
  S5:E17. What Killed the Aztecs?
  Air Date: November 13, 2008
- tbd
  S5:E16. Death of the Universe
  Air Date: October 16, 2008
- tbd
  S5:E15. Giant Crystal Cave
  Air Date: October 12, 2008
- tbd
  S5:E14. Supercontinent
  Air Date: October 9, 2008
- tbd
  S5:E13. Hubble's Amazing Universe
  Air Date: October 5, 2008
- tbd
  S5:E12. Big Bang
  Air Date: September 25, 2008
- tbd
  S5:E11. Earth's Invisible Shield
  Air Date: September 18, 2008
- tbd
  S5:E10. Time Machine
  Air Date: September 11, 2008
- tbd
  S5:E9. First to Cross the Ocean
  Air Date: August 28, 2008
- tbd
  S5:E8. Asteroid Alert
  Air Date: May 27, 2008
- tbd
  S5:E7. Saturn's Secrets
  Air Date: May 25, 2008
- tbd
  S5:E6. Mars: Waterworld
  Air Date: May 25, 2008
- tbd
  S5:E5. Pluto Rediscovered
  Air Date: March 20, 2008
- tbd
  S5:E4. Birth of Life
  Air Date: March 13, 2008
- tbd
  S5:E3. Birth of America
  Air Date: March 6, 2008
- tbd
  S5:E2. The Rockies
  Air Date: February 28, 2008
- tbd
  S5:E1. Grand Canyon
  Air Date: February 11, 2008
Season 4

tbd
- Season 4 Overview
  Air Date: January 31, 2007
Season 3

tbd
- Season 3 Overview
  Air Date: January 15, 2006
Season 2

tbd
- Season 2 Overview
  Air Date: January 5, 2005
Season 1

tbd
- Season 1 Overview
  Air Date: September 15, 2004