|Reversals of the Earth's magnetic field, over the last 169 million years, from now back to the middle Jurassic. The lower picture is an expansion of the boxed region of the upper picture.|
|Earth's magnetic field is generated by currents of molten iron in its outer core, and helps protect us from cosmic rays.|
|Geological records shows that the magnetic field reverses direction from time to time.|
|Note the long intervals of constant orientation, interspersed with many rapid reversals. This does resemble a Cantor set.|
|Maybe the fractal structure of the reversal pattern will shed some light on the mechanism of the reversals.|
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