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Galaxy survey sheds light on dark matter

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11:20am, January 2, 2002

By looking at some of the brightest objects in the universe, astronomers are learning new details about its darkest stuff.

Known as dark matter because it emits no light, this substance accounts for at least 90 percent of the mass of the cosmos. Astronomers hold that dark matter keeps each galaxy intact, holds galaxy clusters together, and originally prompted gas and dust to coalesce into galaxies.

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