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Well, to start with, a rocket creates thrust by expelling combusted fuel out the back of an opening in the tank or fuel container. The thrust is created by the chemical reaction you might call an explosion. A jet engine uses fans and multiple levels of chambers to compress air which it sucks in the front and blows out the back with greater force.

A jet engine sucks oxygen from the air and combusts it with fuel carried in a tank. A rocket engine carries both fuel and oxygen in separate supply tanks and does not require an external oxygen source. For this reason jet engines can only operate inside the Earth's atmosphere, whereas rocket engines can operate outside of the atmosphere.

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