The End of the Universe: Hot or Cold?

We've talked at great length about the beginning of the universe, everything we know, and what we don't yet know. But everything that has a beginning must have an end. How will the universe end? How can we tell? When will it happen? Don't worry, spoiler alert: we will be just fine for many billions of years. But someone might have to deal with it someday! Let's start preparing now.

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