Picture of the month
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Attractor_Poisson_Saturne.jpg/360px-Attractor_Poisson_Saturne.jpg)
Credit: Nicolas Desprez
An attractor is a set to which a dynamical system evolves after a long enough time. That is, points that get close enough to the attractor remain close even if slightly disturbed.
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