By looking at some of the brightest objects in the universe, astronomers are learning new details about its darkest stuff.
Simulation shows that galaxies (dots) trace the dark matter (gray). Red box indicates a dense cluster of galaxies; green box, a more typical, lower-density region. A. J. Benson et al./Monthly Notices Roy. Astro. Soc.
Known as dark matter because it emits no light, this substance accounts for at least 90 percent of the mass of the cosmos.
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