The interstellar medium is mainly hydrogen gas, which is thought to cool to form clouds of molecular hydrogen. But the discovery of a large cloud of cold atomic hydrogen overturns that belief.
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Dickey, J. Dark arc casts a long shadow. Nature 412, 282–283 (2001). https://doi.org/10.1038/35085668
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DOI: https://doi.org/10.1038/35085668
