NASA Spacecraft Embarks on Historic Journey into Interstellar Space by NASA
ID: nasa-spacecraft-embarks-on-historic-journey-into-interstellar-space-by-nasa
Official mission-team announcement, 12 September 2013: www.nasa.gov/news-release/nasa-spacecraft-embarks-on-historic-journey-into-interstellar-space/ . Cited passage: plasma-wave observations in April 2013, inferred electron density and the retrospective August 2012 heliopause crossing.
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