@tibie: a rocket doesn't

a rocket doesn't move by shooting bullets; if that were the case I would have long agreed to the validity of the propulsion;
it moves by pushing it's own fluid out and away from itself, but into what? what is the resistance of it's surroundings? on what it pushes? does it's exhaust change the Void into non-Void?
here's 3 clips if anyone is interested about propulsion in Void(Vacuum effect on higher pressure systems) and also bullets...