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The question is why space ships cannot use propellers or conventional airplane jets to move in space?
I presumed that. But I also thought that space contained cosmic dust and hydrogen and hellium atoms, therefore it can't be a total vacuum.There is no air for them to use. Space is a vacuum.
How exactly would a propeller be ripped to shreads?just imagine those tiny dust particles as micro meteors. Any propellar would be ripped to shreads. Also, there is no where near enough hydrogen or dust to use a propellar let alone a jet engine.
Propellers and jets work because the gas (usually air) they encounter is dense enough to have very small mean-free-paths - thus the particles of gas collide with each other within a short distance and can be relied on to behave like a thin "liquid" in which pressure differences are significant.I presumed that. But I also thought that space contained cosmic dust and hydrogen and hellium atoms, therefore it can't be a total vacuum.