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Science 23 September 2005:
Vol. 309. no. 5743, pp. 2016 - 2017
DOI: 10.1126/science.1118762
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Viewpoint

Journey into the Unknown Beyond

Len A. Fisk

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.

Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI 48109–2143, USA.

E-mail: lafisk{at}umich.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)