ELI5: Explain Like I'm 5

Monopropellant rocket

Okay kiddo, have you ever seen a rocket launch? It's a lot of fun to watch, right? But have you ever thought about how the rocket flies up into space? That's where something called a monopropellant rocket comes in.

A monopropellant rocket is like a big, powerful spray can that shoots out a super hot gas to push the rocket up into space. But instead of the spray can having a button that you push to make the gas come out, the rocket has a special tank filled with a liquid chemical called a monopropellant.

When the rocket is ready to launch, it sends an electrical signal to a little machine called a catalyst bed. The catalyst bed heats up the monopropellant, which makes it turn into a gas. This gas is very hot and shoots out the back of the rocket really fast, which in turn propels the rocket forward and up into space.

Now, remember how the spray can has a nozzle that aims the gas in the direction you want it to go? The rocket has something similar called a nozzle that shapes the gas so that it shoots out the back of the rocket in a specific way. This makes the rocket move in the right direction and go as fast as possible.

So that's how a monopropellant rocket works, kiddo. It's like a big, powerful spray can that shoots out a hot gas to make the rocket fly up into space. Cool, huh?