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A NASA illustration depicts the positions of both Voyager 1 and Voyager 2 probes, now outside the heliosphere. Voyager 1 left the heliosphere in August 2012, while Voyager 2 left at a different location last month. NASA/JPL-Caltech hide caption

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An artist's rendering shows the Milky Way where a supermassive black hole lies at the center. A dozen smaller black holes have now been detected, and a new study suggests the monster is surrounded by about 10,000. Spitzer Space Telescope/NASA/JPL-Caltech/R. Hurt (SSC/Caltech) hide caption

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Spitzer Space Telescope/NASA/JPL-Caltech/R. Hurt (SSC/Caltech)

Center Of The Milky Way Has Thousands Of Black Holes, Study Shows

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Norishige Kanai prior the launch of the Soyuz-FG rocket in Kazakhstan on Dec. 17. As is the norm, the Japanese astronaut grew in outer space, just not by as much as he initially thought. Dmitri Lovetsky/AP hide caption

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Dmitri Lovetsky/AP