Messier 81, a spiral galaxy in the constellation Ursa Major, also known as NGC 3031 or Bode's Galaxy
SN 1993J was at a very similar distance, in M82's larger companion galaxy M81, and SN 1987A was much closer.
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Forming a striking pair in small telescopes with nearby spiral M81, M82 is being physically affected by its larger neighbor.
M81 |