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The liquid metal iron core of a planet creates a magnetic field. This field is not constant. From time to time it reverses, so that a compass points south instead of north. This happens every few million years. We are not sure whether this has any effect upon living things on Earth. Nor do we know when it will happen again, or what causes it.
The Earth's magnetism is very fortunate, since it protects life on Earth from dangerous particles in the solar wind. If planets did not have magnetic fields, life would be impossible.
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Useful Links |
Physical Environment > Earth Magnetic Field
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This site tells the story of the history of the universe. Click Earlier and Later to follow the story.
Note: Many facts have been simplified to make them easier to understand.
Click here to read Time Crystal, history of the Universe as sci-fi fantasy romance!
Note: Many facts have been simplified to make them easier to understand.
Click here to read Time Crystal, history of the Universe as sci-fi fantasy romance!
