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Nature 437, 519-521 (22 September 2005) | doi:10.1038/nature03979;
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A large population of galaxies 9 to 12 billion years back in the history of the Universe
To understand the evolution of galaxies, we need to know as accurately as possible how many galaxies were present in the Universe at different epochs. Galaxies in the young Universe have hitherto mainly been identified using their expected optical colours, but this leaves open the possibility that a significant population remains undetected because their colours are the result of a complex mix of stars, gas, dust or active galactic nuclei.
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