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A new discovery is casting doubt on the idea that a type of star explosion shines with equal brightness wherever it occurs in the universe. The finding could have implications for estimates of the size of the cosmos. Type-1a supernovae are typically used as standard indicators of distance in the vast expanse of the universe. But the discovery of a Type-1a supernova more massive than was thought possible could force astronomers to rethink their ideas about the luminous objects, scientists reported today. ... It was thought that all Type-1a supernovae emit equal amounts of light at their peak and fade...