CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Earth's magnetic field, Cut-away computer illustration of the internal structure of the Earth, showing the magnetic field (blue lines) generated by the eddies (blue spirals) set up in the liquid core. The Earth's magnetic field extends outwards into space for tens of thousands of kilometres, protecting the planet from high-energy radiation from the Sun.
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