Thanks to Brian Mullin
Conservation of Momentum is action. With is reaction with gas fuel ?
If you claim space rockets do not work this way. They work by recoil, then show me why vernier thrusters is used. How you can change direction of recoil force so easy ?
Vernier thrusters were used in Apollo Lunar Module.
How you can change direction of recoil force so easy by Vernier thrusters (RCS) ?
Because this recoil force push rocket where it’s start to move (in fuel tank) – you can not change it’s direction afterwards by changing direction of the burned exhaust gasses.