Traces of hydrogen gas, detected over vast regions of space, have for the first time been used as a standard ruler to measure dark energy — the unknown cosmic energy that is causing the Universe's expansion to speed up.
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Davis, T. Hydrogen wisps reveal dark energy. Nature 498, 179–180 (2013). https://doi.org/10.1038/498179a
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DOI: https://doi.org/10.1038/498179a
