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If there is no drag in space, how is possible to use the same method for thrust in atmosphere and in space? In the atmosphere, air is used for rockets to be pushed from, but in space there is nothing that creates drag and at the same time there is nothing
Rockets don't push against the air to move forward; instead, they use combustion. Rocket thrust is created by mixing an oxidant with fuel, which is then ignited and creates a combustion that pushes on every side of the engine. It can't push as much on the exhaust exit, as there is nothing for it to push upon; you can't push on a hole. Since there is more push on the front than on the back of the engine, the rocket will shoot forward. It's a common misconception that the exhaust pushes the rocket forward, while it is just the result of the combustion.
Propellers would not work in space, since there is no air to create lift; and jet engines would not either, because they take in air to create combustion, instead of carrying it along like rockets do in space.
