>>637547

Space rocket propulsion is done by igniting and expelling reaction mass. Same reason why exploding gunpowder will exert kickback even in an empty vacuum chamber. This is basic high school physics shit.

>>637802

>Rocket exhaust is pushing against nothing.

Wrong. The exploding reaction mass pushes against the rocket, forcing it to move away. Space travel requires you to bring your own molecules to push off, which is exactly what rocket fuel is.

>>637870

You didn't even watch the video, you disingenuous git. The can starts moving before the expelled fluid even hits the chamber wall at all.

>>637901

Methinks you meant to reply to some other anon.

>>637926

Yeah. While I don't trust NASA either, basic rocketry has nothing to do with that. Just annoying to get lumped in with those ignorant of the most simple of physics.