Quote:
Originally posted by Nightshift
The void of space can not be nothing, if it were, rocket engines would not produce thrust, a high pressure ejection creating movement based on a lower pressure on it's opposite side?
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A rocket doesn't 'push' against air, it pushes against itself. Rocket fuel burns, gases expand, expanding gases come out at high velocity, momentum changes producing thrust. All a rocket is doing is shifting its mass in the opposite direction of it's travel. The hot expanding gases push on the rocket and the rocket pushes on the gases... which is why a rocket works in a vacuum.