In 1994, Roland Emmerich gave us "Stargate," a standalone sci-fi adventure ... Is this kind of (potentially) timeline-altering time hop viable in real life, even on a purely theoretical level?

This post contains spoilers for the "Stargate" franchise. Roland Emmerich's 1994 sci-fi drama "Stargate" posits an intriguing premise. An ancient ring-shaped ... about sentient life in the ...