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NGC_2023 Liên kết ngoàiThực đơn
NGC_2023 Liên kết ngoàiLiên quan
NGC 2023 NGC 2022 NGC 202 NGC 203 NGC 223 NGC 2623 NGC 2029 NGC 2032 NGC 2027 NGC 2035Tài liệu tham khảo
WikiPedia: NGC_2023 http://cseligman.com/text/atlas/ngc20.htm#2023 http://www.fromquarkstoquasars.com/apotd-ngc-2023/ http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC... http://vizier.u-strasbg.fr/viz-bin/VizieR-S?NGC%20... //doi.org/10.1071%2FAS98194 http://www.spacetelescope.org/images/potw1130a/ http://server1.wikisky.org/starview?object=NGC+202... http://www.wikisky.org/?object=NGC+2023 http://www.wikisky.org/?object=NGC+2023&img_source...