News From the Field
Cosmic accounting reveals missing light crisis
July 8, 2014
The vast reaches of empty space between galaxies are bridged by tendrils of hydrogen and helium, which can be used as a precise "light meter." Now, a team of scientists has found that the light from known populations of galaxies and quasars is not nearly enough to explain observations of intergalactic hydrogen. The difference is a stunning 400 percent.
Carnegie Institution of Science
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