The final doomsday scenario, for the universe, which is extremely unlikely, is The Vacuum decay.
A tiny bubble of ‘true vacuum’ could form, owing to instability in the field associated with the Higgs boson.
That might happen, if, say a black hole evaporates in just the wrong way.
Such a bubble would expand at the speed of light, destroying everything, until it cancels the universe.
Vacuum decay, might already have begun in some distant place, and We won’t see it coming.
Not to worry though, whatever it looks like,
the end probably won’t be nigh for at least 200 billion years.
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source : https://www.nature.com/articles/d4158....
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