The StarGate is Scifi while the Star Trek transporter is fantasy. While I do not expect the future to provide a Star Gate, it is not fantasy due to equipment at the destination. There never will be a Star Trek transport technology due to lack of equipment at the destination, making it fantasy. BTW: Even if worm holes exist, they will not be usable for transportation between two arbitrarily chosen locations. Time travel to the past is another fictional concept which is fantasy. The past no longer exists. BTW: The fictional version of time travel neglects the requirement for significant space travel. I wonder what space coordinate system is applicable to this problem. Perhaps if some form of time travel is invented, it will be more usable as a space travel technology. Do others here have similar examples of fantasy versus SciFi concepts.