Photo: Unknown "Structures" Tugging at Universe, Study Says

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The so-called Bullet Cluster of galaxies lies 3.8 billion light-years away. It's one of hundreds that have been found to be carried along by a mysterious "dark flow," an October 2008 study says.

The dark flow is caused by unknown clumps of matter outside the known universe, which are pulling our entire universe toward them, the study suggests. The report hints that, whatever may be beyond the known universe, it's like nothing we know.

Image courtesy NASA/STScI/Magellan/U. Arizona/D. Clowe, et al

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