Cosmology: Hydrogen was not ionized abruptly

Journal name:
Nature
Volume:
468,
Pages:
772–773
Date published:
DOI:
doi:10.1038/468772b
Published online

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

References

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Affiliations

  1. Jonathan Pritchard and Abraham Loeb are in the Institute for Theory and Computation, Harvard University, Cambridge, Massachusetts 02138, USA.
    jpritchard@cfa.harvard.edu; aloeb@cfa.harvard.edu

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