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Cosmology

Hydrogen was not ionized abruptly

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When and how the first stars and galaxies ionized the primordial hydrogen atoms that filled the early Universe is not known. Observations with a single radio antenna are opening a new window on the process. See Letter p.796

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Figure 1: The 21-centimetre cosmic hydrogen signal.

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Pritchard, J., Loeb, A. Hydrogen was not ionized abruptly. Nature 468, 772–773 (2010). https://doi.org/10.1038/468772b

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