Kurzgesagt gives us “Three Ways to Destroy the Universe” (6
min).
“The Big Rip” is often presented as the most likely. Dark energy causes space to expand with
acceleration. Space between galaxies
expands first (maybe the Bootes Void?) but eventually gravity is not strong
enough to hold galaxies, then stars, then planets, then even atoms together.
The second is a “heat death” (or big freeze) driven by entropy,
but it might be reversed by “quantum tunneling”.
The third is a “big crunch”, a reversing process that might
eventually rebound with another big bang, a cycle that could go on infinitely.
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