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NASA satellites find high-energy surprises in 'constant' Crab Nebula
Science Centric (13 Jan 2011 17:15 GMT) - The combined data from several NASA satellites has astonished astronomers by revealing unexpected changes in X-ray emission from the Crab Nebula, once thought to be the steadiest high-energy source in the sky…— copy and paste the formatted text using the form to the left.