Arrival and Departure

Nuclear meltdown? Stay cool. Asteroid strike? Shrug it off. They're nothing compared to what would happen if our universe collided with another universe. A UC Santa Cruz physicist explains in Discover Magazine:

As an alien cosmos came crashing into ours, its outer boundary would look like a wall racing forward at nearly the speed of light; behind that wall would lie a set of physical laws totally different from ours that would wreck everything they touched in our universe. “If we could see things in ultraslow motion, we’d see a big mirror in the sky rushing toward us because light would be reflected by the wall. After that we wouldn’t see anything—because we’d all be dead.”

Not even Bruce Willis could save us.