A simple explanation why most of the mass in the Universe is not visible unites questions such as the ionization of intergalactic clouds and the age of the Universe in an arresting way.
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Maddox, J. Making the Universe hang together. Nature 348, 579 (1990). https://doi.org/10.1038/348579a0
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DOI: https://doi.org/10.1038/348579a0
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