Space time

YOU SEE SPACE TIME IS ONE THEORY FOR TIME TRAVEL; THIS IS BECUASE WHEN WE MOVE FASTER TO THE SPEED OF LIGHT (THE MAX SPEED LIMIT BEING 300,000 KILOMETERS PER SECOND) TIME SLOWS DOWN TO THE THING MOVING BUT THE OBSERVER DOES NOT THEREFORE WHEN WE RETURN EVERYTHING HAS AGED FASTER THAN US EFFECTIVELY CAUSING TIME TRAVEL