Messier 81 (inozivikanwawo se NGC 3031 kana kuti Bode's Galaxy) igwara renzou riri kure nemamiriyoni gumi nemaviri emakore-chiedza, rine dhayamita yemakore-chiedza zviuru makumi mapfumbamwe, rinenge hafu yehukuru hweMilky Way, muchiratidziro chenyeredzi cheUrsa Major. Nekuda kwekuswedera kwayo kuPasi, kukura kwayo kukuru, uye musimboti wegwara renzou unoshanda (uyo une 70 mamirioni M <unk> supermassive black hole), Messier 81 yakadzidzwa zvakanyanya nevanoongorora nyeredzi vane hunyanzvi. Kukura kukuru kwegwara renzou uye kupenya kwakanyanya kunoita kuti ive chinangwa chakakurumbira chevanoongorora nyeredzi. Messier 81 yakatanga kuwanikwa naJohann Elert Bode musi waZvita 31, 1774. Naizvozvo, gwara renzou dzimwe nguva rinotumidzwa kuti "Bode's Galaxy". Muna 1779, Pierre Méchain naCharles Messier vakazivisazve Bode's object, iyo yakazoiswa muMessier Catalogue.
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