"Three "rivers" of stars have been discovered stretching thousands of light years
across the northern sky. The smoothness of their trailing arcs may help scientists
learn more about the nature of dark matter in our galaxy, the Milky Way.

Earlier in March, Caltech researcher Carl Grillmair and Roberta Johnson, a graduate
student at California State University, Long Beach, both in the US, reported a tail
of stars covering at least 45° of the sky. It lies between the Big Dipper's bowl and
Arcturus, a bright star in the constellation Bootes."

More at http://www.newscientistspace.com/article/dn8878
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