Messier 81 (wanda aka fi sani da NGC 3031 ko Bode's Galaxy) wani galaxy ne mai tsaka-tsalle kimanin shekaru miliyan 12 mai nisa, tare da diamita na shekaru 90,000, kimanin rabin girman Milky Way, a cikin tauraron Ursa Major. Saboda kusanci da Duniya, girmansa, da kuma ƙwayar galactic mai aiki (wanda ke dauke da ramin baki mai nauyin miliyan 70), Messier 81 ya yi nazari sosai ta hanyar masu binciken astronomers. Girman girman galaxy da kuma haske mai haske ya sa ya zama manufa mai mahimmanci ga masu binciken astronomers. Messier 81 ya fara gano shi ne daga Johann Elert Bode a ranar 31 ga Disamba, 1774. Saboda haka, ana kiran galaxy a matsayin "Bode's Galaxy".
Miliyan 12