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WikiPedia: Nhật_quyển http://www.astronomycast.com/astronomy/episode-65-... http://www.cnn.com/2005/TECH/space/05/25/voyager.s... http://www.cosmosmagazine.com/node/1296 http://www.newscientist.com/article.ns?id=mg186250... http://www.sciencedaily.com/releases/2010/05/10052... http://spacefellowship.com/news/art14466/cassini-d... http://www.universetoday.com/am/publish/size_of_he... http://books.google.de/books?id=W_oZYFplXX0C&pg=PA... http://www.galex.caltech.edu/ http://www.dartmouth.edu/~hrm/R/heliosphere.html