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Nature 438, 39 (3 November 2005) | doi:10.1038/438039a; Published online 2 November 2005

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Cosmology: The infrared dawn of starlight

Richard S. Ellis1

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The modest-sized but successful Spitzer Space Telescope has detected fluctuations in cosmic light at infrared frequencies. Is this the signature of the first population of stars that formed in the Universe?

On page 45 of this issue, Kashlinsky et al.1 present observations that reveal clustering in the distribution of cosmic infrared light over and above that expected from the combined effect of known galaxies. This excess signal could conceivably be light from stars that switched on when the Universe was just a tiny fraction of its present age.

  1. Richard S. Ellis is at the California Institute of Technology, MS 105-24, Pasadena, California 91125, USA.
    Email: rse@astro.caltech.edu

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