Astronomers working with the infrared Spitzer Space Telescope believe they have found evidence of the first visible structure in the universe, clumps of patchy infrared light that can be observed when the light of closer stars and galaxies is masked. "We have shut down the lights of the universe to see the outlines of its first fireworks," says Alexander Kashlinsky of NASA's Goddard Space Flight Center, the lead author of two reports on the findings to be published in Astrophysical ...

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