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Cold Spot suggests largest structure in Universe: A supervoid 1.3 billion light years across

In 2004, astronomers examining a map of the radiation left over from the Big Bang discovered the Cold Spot, a larger-than-expected unusually cold area of the sky. The physics surrounding the Big Bang theory predicts warmer and cooler spots of various sizes in the infant universe, but a spot this large and this cold was unexpected.

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sciencedaily.com
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