The basic movement of science that rockets use is Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction.

Here's how it applies to rockets:

1. Action: The rocket engine burns fuel, producing hot gas.

2. Reaction: The hot gas is expelled out of the rocket nozzle at high velocity. This expulsion creates a force in the opposite direction, propelling the rocket forward.

This is essentially how rockets work: they push hot gas out one way, and the gas pushes the rocket in the opposite direction.

It's important to note that rockets don't require anything to push against, like air. They work in a vacuum, like space, because of the principle of momentum conservation. The hot gas carries momentum, and by expelling it, the rocket gains an equal and opposite momentum, resulting in its movement.