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Theory suggests a pre-Big Bang universe

Some people are loath to take a lopsided view of the universe, but cosmologist Sean Carroll and his colleagues are positively reveling in it. Embracing a study that suggests the pattern of radiation left over from the Big Bang looks surprisingly different from one side of the sky to the other, Carroll and colleagues have come up with some mind-bending possibilities to explain the puzzle, described in a paper posted online June 3.

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