'Rocket fuel' is actually 'Reaction mass'.
It's the actual action of the mass leaving the vehicle that imparts the motion to move in the other.
An astronaut with a pistol/gun would be under the same eftect. As the bullet and gases go one way the astronaut and gun go the other.
The same (Just different acceleration velocities) with a power supply + laser going the opposite direction to the photons leaving the lens.
Please, go and check out Scott Manly's vids. He can explain it much more entertaingly (And with pictures!) than I.
It's the actual action of the mass leaving the vehicle that imparts the motion to move in the other.
An astronaut with a pistol/gun would be under the same eftect. As the bullet and gases go one way the astronaut and gun go the other.
The same (Just different acceleration velocities) with a power supply + laser going the opposite direction to the photons leaving the lens.
Please, go and check out Scott Manly's vids. He can explain it much more entertaingly (And with pictures!) than I.