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M81 with satellite galaxy Holmberg IX in the top center-right corner. Messier 81 is the largest galaxy in the M81 Group, a group of 34 in the constellation Ursa Major. Only one supernova has been detected in Messier 81.
| Credit: Ken Crawford |
M81 with satellite galaxy Holmberg IX in the top center-right corner. Messier 81 is the largest galaxy in the M81 Group, a group of 34 in the constellation Ursa Major. Only one supernova has been detected in Messier 81.