The Heavens in a Pile of Sand

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Science  01 Nov 2002:
Vol. 298, Issue 5595, pp. 979-980
DOI: 10.1126/science.1075555

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Recent studies have shown that the intricate spatial and temporal patterns displayed by Earth's aurora are fractal, that is, they are the same when viewed on any scale. In their Perspective, Freeman and Watkins discuss the evidence for this fractal behavior and ask how it may arise.