Jan 13, 2016

A dark-matter galaxy ‘just’ buzzed the Milky Way’s edge

Posted by in category: cosmology

For the past ten years, astronomers have puzzled over cosmic ripples in the structure of the Milky Way that didn’t have a known cause. Thanks to a trio of pulsing stars, we now suspect a dwarf galaxy made of dark matter swung through our galactic neighborhood 500 million years ago — with results we can still see today.

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