This is the way the universe ends: not with a whimper, but a bang.

https://www.sciencemag.org/news/2020/08/way-universe-ends-not-whimper-bang

Source:  By Adam Mann, Science Magazine. 

Excerpt: In the unimaginably far future, cold stellar remnants known as black dwarfs will begin to explode in a spectacular series of supernovae, providing the final fireworks of all time. That’s the conclusion of a new study, which posits that the universe will experience one last hurrah before everything goes dark forever. ...The known laws of physics suggest that by about 10¹⁰⁰ (the No. 1 followed by 100 zeros) years from now, star birth will cease, galaxies will go dark, and even black holes will evaporate through a process known as Hawking radiation, leaving little more than simple subatomic particles and energy. The expansion of space will cool that energy nearly to 0 kelvin, or absolute zero, signaling the heat death of the universe and total entropy. ...The particles in a white dwarf stay locked in a crystalline lattice that radiates heat for trillions of years, far longer than the current age of the universe. But eventually, these relics cool off and become a black dwarf. ...over long time periods, quantum mechanics allows particles to tunnel through energetic barriers, meaning fusion can still occur, albeit at extremely low rates. When atoms such as silicon and nickel fuse toward iron, they produce positrons, the antiparticle of an electron. These positrons would ever-so-slowly destroy some of the electrons in a black dwarf’s center and weaken its degeneracy pressure. For stars between roughly 1.2 and 1.4 times the Sun’s mass—about 1% of all stars in the universe today—this weakening would eventually result in a catastrophic gravitational collapse that drives a colossal explosion similar to the supernovae of higher mass stars, Caplan reports this month in the Monthly Notices of the Royal Astronomical Society. Caplan says the dramatic detonations will begin to occur about 10¹¹⁰⁰ years from now, a number the human brain can scarcely comprehend. The already unfathomable number 10¹⁰⁰ is known as a googol, so 10¹¹⁰⁰ would be a googol googol googol googol googol googol googol googol googol googol googol years. The explosions would continue until 10³²⁰⁰⁰ years from now, which would require most of a magazine page to represent in a similar fashion....