In this artist rendering released by NASA, the Voyager 1 spacecraft explores a new region of space at the edge of the solar system. New research published Thursday, June 27, 2013 in the journal Science confirms the NASA spacecraft has not yet crossed into interstellar space, or the space between stars. (AP Photo/NASA)

Associated Press
In this artist rendering released by NASA, the Voyager 1 spacecraft explores a new region of space at the edge of the solar system. New research published Thursday, June 27, 2013 in the journal Science confirms the NASA spacecraft has not yet crossed into interstellar space, or the space between stars. (AP Photo/NASA)
In this artist rendering released by NASA, the Voyager 1 spacecraft explores a new region of space at the edge of the solar system. New research published Thursday, June 27, 2013 in the journal Science confirms the NASA spacecraft has not yet crossed into interstellar space, or the space between stars. (AP Photo/NASA)
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