Final answer:
Newton's third law implies conservation of momentum in observable spatial dimensions and does not describe producing thrust through time. Current physical theories do not provide mechanisms for exerting force along the temporal dimension, rendering time travel by means of Newton's third law speculative.
Step-by-step explanation:
Newton's third law of motion tells us about the fascinating symmetry in nature, emphasizing that forces always come in action-reaction pairs. According to the law, whenever a body exerts a force, there is an equal and opposite force in response. Mathematically, for two bodies A and B, the force A exerts on B is equal in magnitude but opposite in direction to the force B exerts on A, represented as FAB = -FBA.
Regarding the concept of time travel, the law implies a conservation of momentum in the spatial dimensions we can observe. Extending this physically-established symmetry into time as a dimension, particularly with the aim to produce thrust through time, enters speculative physics and science fiction domains. Currently, physics does not provide a mechanism by which force can be exerted in the 'direction' of time in a manner analogous to physical movement in space for the purpose of time travel.