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Hydrogen wisps reveal dark energy

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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Figure 1: Useful shadows.



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Correspondence to Tamara M. Davis.

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Davis, T. Hydrogen wisps reveal dark energy. Nature 498, 179–180 (2013).

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