The question of how much light the first stars produced is fundamental to models of the Universe's development. But observations have so far failed to agree: is the answer a lot, or not very much at all?
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Madau, P. Trouble at first light. Nature 440, 1002–1003 (2006). https://doi.org/10.1038/4401002a
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DOI: https://doi.org/10.1038/4401002a
