The Crab Nebula, shown in a composite X-ray, visible-light and infrared view, may have finally yielded its secrets. An astronomer proposes that it is the product of a rare kind of supernova. X-ray: J. Hester/ASU, CXC; Optical: J. Hester and A. Loll/ASU, NASA, ESA; Infrared: R.
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