Nearly 34 years after leaving Earth, Voyager 1 and Voyager 2, humankind’s most distant space emissaries, are closing in on the border crossing to interstellar space, flying at 17 kilometers per second now through what seems to be a strange sea of humongous and “frothy” magnetic bubbles.
The Voyagers are in the heliosheath, the boundary region between our solar system and the rest of the Milky Way Galaxy, and have been since each crossed the Termination Shock in December 2004 and August 2007 respectively. But about four years ago, Voyager 1 began sending home data that indicated the spacecraft was flying through something weird, something the scientists had not anticipated.
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