How the Universe Will End, According to a Renowned Astrophysicist

Cosmologist Katie Mack explains the leading theories — from heat death to the Big Crunch — on how the universe will cease to exist

Various planets and stars in space.

Some say the world will end in fire,
Some say in ice.
From what I’ve tasted of desire
I hold with those who favor fire.
But if it had to…

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