This is an image taken by the Hubble telescope of a binary star system (named AFGL 3068) in which one star is a a carbon star, a dying red giant, which throws off material in which appears to us to be a spiral pattern. The explanation of this very strange star system is at Bad Astronomy. Link -via Monkeyfilter
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Weird. So it's kind of an illusion, but not? Interesting...
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