* Newton's Third Law: Rockets work based on Newton's Third Law of Motion: for every action, there is an equal and opposite reaction.
* Exhausting Mass: Rockets carry fuel and oxidizer (usually liquid oxygen). When the fuel burns, it produces hot, expanding gases that are ejected out of the rocket's nozzle.
* Momentum Transfer: The ejected gases have momentum in one direction. To conserve momentum, the rocket itself must move in the opposite direction.
Think of it like this: Imagine you're on roller skates and you throw a heavy bowling ball forward. As the ball goes forward, you will be pushed backward. The rocket does the same thing, but instead of a bowling ball, it's expelling hot gas.
Space is not a perfect vacuum: While space is incredibly empty, it's not completely devoid of matter. There's a tiny amount of gas and dust, but it's not enough to provide significant resistance to the rocket.
In Summary: Rockets don't need to push against anything in space. They work by expelling mass in one direction, which causes the rocket to move in the opposite direction.
