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The galaxy cluster 1E 0657-56 (known as the Bullet Cluster) lies 3.8 billion light-years away. It's one of hundreds that appear to be carried along by a mysterious cosmic flow. | NASA/STScI/Magellan/U.Arizona/D.Clowe et al.
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Mysterious 'Dark Flow' May Be Tug of Other Universe

A mysterious 'dark flow' may be the tug of another universe. Learn why scientists believe that a mysterious 'dark flow' may be the tug of another universe.

March 18, 2010
3:00 AM EDT