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This composite X-ray, visible-light and infrared view of the Crab nebula shows an array of complex knots or wisps. One such wisp may be the site of a recently detected gamma-ray outburst in the Crab. Credit: X-ray: J. Hester/ASU, CXC. Optical: J. Hester and A. Loll/ASU, NASA, ESA. Infrared: R. Gehrz/U of Minn., JPL/NASA

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