A one-two punch of dark matter may have knocked holes in a stream of stars out past the edge of the Milky Way. If confirmed, these would be the smallest clumps of dark matter we have ever detected.
“Potentially, this stream could allow us to probe for the first time how dark matter behaves on a small scale,” says Sergey Koposov at the University of Cambridge.
Dark matter is an all-pervasive yet invisible substance responsible for much of the large-scale structure of the universe. We can see its powerful gravitational effects at work, but have never seen it directly and we are still uncertain as to its exact nature.
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