New maps of the cosmic dark

Probing galactic distortions reveals web of invisible matter

By Nadia Drake, 12:00 PM January 10, 2012

AUSTIN, Texas — Astronomers might not know what dark matter is or be able to see it, but at least they know something about where it is. Using telltale distortions in light from distant galaxies, scientists have mapped out clumps and strings of the invisible stuff on a larger scale than ever before.

One set of maps, presented January 9 at a meeting of the American Astronomical Society, comes from five years of observations made by the Canada-France-Hawaii Telescope in Hawaii. The work cover...

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