When massive stars die at the end of their short lives, they light up the cosmos with bright, explosive bursts of light and material known as supernovae. A supernova event is incredibly energetic and intensely luminous—so much so that it forms what looks like an especially bright new star that slowly fades away over time.
Source:
https://phys.org/news/2019-06-hubble-sights-explosive-galaxy.html