SN 1993J

Supernova 1993J was a powerful stellar explosion observed in the galaxy M81, located about 11 million light-years away. It was unusual because it was a core-collapse supernova that resulted from a massive star exhausting its fuel and collapsing under its gravity, creating an extremely bright burst of light. What made SN 1993J notable was its unusual light curve and evidence that the star had lost much of its outer material before exploding, likely due to interaction with a companion star. This event provided valuable insights into how massive stars die and the complex processes involved in supernovae.