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- ^ http://interstellar.jpl.nasa.gov/interstellar/probe/introduction/neighborhood.html (頁面存檔備份,存於網際網路檔案館), Our Local Galactic Neighborhood, NASA
- ^ http://www.centauri-dreams.org/?p=14203 (頁面存檔備份,存於網際網路檔案館), Into the Interstellar Void, Centauri Dreams
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- ^ http://iopscience.iop.org/0004-637X/593/2/868/pdf/17092.web.pdf, LOCAL INTERSTELLAR MATTER: THE APEX CLOUD, 22 October 2012
- ^ http://www.newscientist.com/blogs/shortsharpscience/2012/02/spacecraft-probes-gas-cloud-sw.html (頁面存檔備份,存於網際網路檔案館), Spacecraft probes gas cloud swaddling the solar system, New Scientist, 22 October 2012