NGC 6818
NGC 6818
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NGC 6818Liên quan
NGC NGC 4993 NGC 4302 NGC 2392 NGC 404 NGC 6822 NGC 4565 NGC 3393 NGC 5238 NGC 4889Tài liệu tham khảo
WikiPedia: NGC 6818 http://simbad.u-strasbg.fr/Simbad http://www.nasa.gov/image-feature/goddard/hubble-f... http://www.daviddarling.info/encyclopedia/L/Little... http://www.spacetelescope.org/images/opo9811h/ http://server1.wikisky.org/starview?object=NGC+681... http://www.wikisky.org/?object=NGC+6818 http://www.wikisky.org/?object=NGC+6818&img_source... http://www.wikisky.org/?object=NGC+6818&img_source... http://www.wikisky.org/?object=NGC+6818&img_source... http://www.wikisky.org/?object=NGC+6818&img_source...