How the Universe Will End: 6 Scenarios for the Cosmic Finale

The greatest minds have once again started pondering eternity — and the possibility that it might not be so eternal after all.

Big Crunch: collapse instead of eternity

One recent forecast says: if dark energy turns out to be unstable, the Universe won't expand forever.

Instead, in roughly 33 billion years it's headed for reverse contraction and total collapse. The name fits: the Big Crunch. An apocalypse on slow heat.

Big Freeze: the slow art-house ending

The Big Freeze is the most depressing option of all. The Universe expands forever, stars burn out, matter decays, and all that's left are black holes — which, after trillions of years, evaporate too. Absolute emptiness. Closing credits, art-house style.

Big Rip: apocalypse on steroids

If dark energy doesn't just keep inflating space but starts accelerating, it will tear everything apart: first galaxies, then planets, then atoms. Literally. The end of the world, expansion-on-steroids edition.

Big Bounce: the eternal reboot

The option for optimists. The Universe contracts, but instead of total death, there's a new Big Bang. And so it goes, round and round, like an infinite reboot. We might not even be the first iteration.

Vacuum Decay: the end with no warning

Physics on maximum difficulty. If our vacuum isn't the most stable one out there, at some point a bubble of true vacuum could trigger a quantum snap that instantly rewrites all the laws of nature. Fast. Painless. No warning.

Boltzmann Brain: solipsism in space

Not exactly an ending, but a grim thought all the same: if the Universe lives forever, sooner or later a conscious brain will randomly pop into existence — one that believes it's you. Hello, solipsism.

So if you keep putting off the important stuff for later, know this: "later" might end in one of six versions of cosmic apocalypse.

But for now we've still got a couple dozen billion years, so feel free to grab a coffee and act like everything's under control.