Propulsion in a Vacuum
If outer space is a vacuum where there is no
resistance how can a vehicle adjust its course as there is
nothing for the boosters to push against?
there is no need for the boosters to have something outside the
motor to push against. What they are pushing against is their own
fuel. By accelerating their fuel as quickly as possible out the
rear of the engine, Newton's second law is invoked, and the engine
pushes itself the other way.
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Update: June 2012