NGC_220
NGC_220
Thực đơn
NGC_220Liên quan
Tài liệu tham khảo
WikiPedia: NGC_220 http://cseligman.com/text/atlas/ngc2.htm#220 http://ned.ipac.caltech.edu/cgi-bin/objsearch?objn... http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=... http://spider.seds.org/ngc/revngcic.cgi?NGC220 http://server1.wikisky.org/starview?object=NGC+220 http://www.wikisky.org/?object=NGC+220 http://www.wikisky.org/?object=NGC+220&img_source=... http://www.wikisky.org/?object=NGC+220&img_source=... http://www.wikisky.org/?object=NGC+220&img_source=... http://www.wikisky.org/?object=NGC+220&img_source=...