How scientifically feasible are force shields?
Short answerA shield based on controllable gravitational or electromagnetic effects is more plausible than an unexplained barrier, though the required technology remains speculative.
NotesGravitational or electromagnetic shielding is the more plausible route because both start from forces already observed in nature. The speculative leap is learning to generate and shape those fields strongly enough to protect a ship. A gravitational design from a novel provides an example of internally consistent worldbuilding rather than proof of engineering feasibility. Fictional protection becomes easier to assess when its operation begins with a recognizable physical principle.