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So it would work for orientation but not as a means of maneuvering which does answer that question, wish i'd asked sooner. However gyroscopes DO work on my original principal on earth? They try to stay upright if you try and move the housing around them? I remember this toy that you had to try and twist your wrist in circular motions to speed up the gyroscope inside at which point it exerts force as it tries to spin
The Voyager probes use gyroscopes to help aim the antenna back towards Earth without the need of using thrusters. If you were building a spaceship with a fixed location of the exhaust ports, you could use the gyroscope to make rapid orientation changes of the spacecraft, without having to use thrusters (and thus loosing propellant). However, if you are doing multiple course changes, there would also be benefit of building the entire spacecraft as light as possible, so the added mass of the gyroscope may be counter-productive.
Travel at the speed of light is not a theoretical challenge: in principle you could locate the position of every atom in a person's body, encode that onto a laser beam, and send that to a receiver which would reconstruct every atom in its original position. Far beyond current technology, but not forbidden.
The challenge that is beyond current physics is to make the transition between traveling slower than light and going faster than light. If you try to do it by rockets, it would take all the mass in the universe and you still wouldn't be going faster than light.
We don't have a solution to this today, so many science fiction writers gloss over this aspect of interstellar travel, or speculate about travel through another dimension, which is theoretically possible (even if we have no idea how...).