Voyager 1, a satellite launched by NASA in late 1977, is on the edge of interstellar space. Based on an increase of high energy particles, the satellite could cross over into interstellar space at any time.
BBC News: http://www.bbc.co.uk/news/science-environment-18458478
NASA: http://www.nasa.gov/mission_pages/voyager/voyager20120614.html
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