So, this is just theoretical.
Basically, in what circumstances can a spontaneous wormhole come out of nowhere on Planet Earth (say somewhere in the North Atlantic Ocean) that projects onto another planet (say, a large habitable planet some tens of millions of light years away from Earth)?
Cruise is heading from Senegal to Miami, Florida. Somewhere around the Mid-Atlantic, the passengers are enjoying a cool night on the deck, when suddenly, out of nowhere, a strange vortex like shape rips into the air. It's fairly large - stretches from the ocean surface to about 100 feet in the air. It leads to the planet mentioned above. Think of it as a spontaneous and unbound "Stargate".
Is it unscientific? Do the laws of physics not allow for spontaneous wormholes on planets? If they don't, I guess if this were part of a sci-fi story, we'd have to introduce some extra elements (say, for example, ancient alien portal)?
My housemates are stealing my food