PerspectivePlanetary Science

News from the Edge of Interstellar Space

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Science  06 Jul 2001:
Vol. 293, Issue 5527, pp. 55-56
DOI: 10.1126/science.1060090

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The Voyager 1 and Voyager 2 spacecraft are currently traveling through the outer reaches of the solar system. As Stone explains in this Perspective, Voyager 1 may soon encounter the termination shock, a region that provides a clue to the overall size of the heliosphere. Current estimates suggest that the termination shock is located at 80 to 100 times the Sun-Earth distance; Voyager 1 may soon provide a more precise answer.