Special Viewpoints

Journey into the Unknown Beyond

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Science  23 Sep 2005:
Vol. 309, Issue 5743, pp. 2016-2017
DOI: 10.1126/science.1118762

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The Voyager 1 spacecraft has passed an important milestone. As is reported in papers in this issue, Voyager 1 has crossed the termination shock of the solar wind, where the wind abruptly decelerates to begin its merger into the local interstellar medium. The termination shock provided surprises; the region beyond is truly uncharted territory.

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