Rank #20
The universe is estimated to contain around 10^22 to 10^24 supernovae.
This description provides an overview of the estimated number of supernovae in the universe. Supernovae are the explosive death of a massive star, and are estimated to range from 10^22 to 10^24 in the universe. This number is based on observations of the visible universe and estimates
From Wikipedia
Current observations suggest that the expansion of the universe will continue forever. The prevailing theory is that the universe will cool as it expands, eventually becoming too cold to sustain life. For this reason, this future scenario popularly called "Heat Death" is also known as the "Big Chill" or "Big Freeze". Some of the other popular theories include the Big Rip, the Big Crunch, the Big Bounce, and the Big Slurp.