Thực đơn
Messier 61Thực đơn
Messier 61Liên quan
Messier 87 Messier 77 Messier 4 Messier 5 Messier 66 Messier 102 Messier 110 Messier 15 Messier 100 Messier 74Tài liệu tham khảo
WikiPedia: Messier 61 http://www.atlasoftheuniverse.com/galgrps/vir.html http://ned.ipac.caltech.edu/cgi-bin/objsearch?objn... http://www.cbat.eps.harvard.edu/lists/Supernovae.h... http://goldmine.mib.infn.it/ http://messier.seds.org/m/m061.html http://server1.wikisky.org/starview?object=Messier... http://www.wikisky.org/?object=Messier+61 http://www.wikisky.org/?object=Messier+61&img_sour... http://www.wikisky.org/?object=Messier+61&img_sour... http://www.wikisky.org/?object=Messier+61&img_sour...