Using telescopes, more than ten thousand have been observed in other galaxies, but I will limit my answer mainly to our own Milky Way Galaxy. Strangely enough, none have been observed in our galaxy since the use of telescopes in astronomy. read more
Several additional supernovae within the Milky Way galaxy have been recorded since that time, with SN 1604 being the most recent supernova to be observed in this galaxy. Since the development of the telescope, the field of supernova discovery has expanded to other galaxies. read more