10 doomsday theories about the universe (With Pictures)

2. Vacuum Metastability Event

Some scientists suggest that our universe is moving unstably on the edge of stabilitywhich is capable of getting disrupted and if disrupted the universe will enter a different state which is more stable. So some billion years later the universe will simply tip over the brink. And then a bubble of lower-energy vacuum will appear, just like that, out of the blue. This bubble will expand in all directions wiping out everything it touches. Weird!

Weirder is the fact that the universe will still exist after that, but with different laws of physics and different life forms.