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WikiPedia: Quang_cầu http://www.ingentaconnect.com/content/bsc/mnr/2004... http://www.mps.mpg.de/solar-physics/slam http://solar-center.stanford.edu/vitalstats.html http://solarscience.msfc.nasa.gov/feature1.shtml http://www.arxiv.org/abs/astro-ph/0210207 http://alienworlds.southwales.ac.uk/sunStructure.h... http://alienworlds.southwales.ac.uk/sunStructure.h... https://imagine.gsfc.nasa.gov/science/objects/sun1... https://history.nasa.gov/SP-402/p2.htm https://web.archive.org/web/20050217044235/http://...