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A rocket can move in air free space, but...

A rocket can move in air free space, but a jet plane cannot. Why?

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A rocket is self contained in the sence that both the fuel and oxygen needed to burn the fuel are availiable inside the rocket. Therefore, a force can move in air free space. A jet plane has fuel only. It needs to take oxygen from the atmosphere to burn fuel. That is why a jet plane cannot oprate in air free space.
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