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Date: 2013-01-24 03:55:19Cygnus OB2 Stellar evolution Extinction B-V colour Hertzsprung–Russell diagram Cygnus Stellar classification Apparent magnitude Cygnus OB2-12 Astronomy Observational astronomy Space | Физически факултет, том 104Add to Reading ListSource URL: www.phys.uni-sofia.bgDownload Document from Source WebsiteFile Size: 596,21 KBShare Document on Facebook |