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.
References
Busca, N. G. et al. Astron. Astrophys. 552, A96 (2013).
Slosar, A. et al. J. Cosmol. Astropart. Phys. 026; http://dx.doi.org/10.1088/1475-7516/2013/04/026 (April 2013).
Eisenstein, D. et al. Astrophys. J. 633, 560–574 (2005).
Beutler, F. et al. Mon. Not. R. Astron. Soc. 416, 3017–3032 (2011).
Anderson, L. et al. Mon. Not. R. Astron. Soc. 427, 3435–3467 (2012).
Blake, C. et al. Mon. Not. R. Astron. Soc. 418, 1707–1724 (2011).
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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
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