system
Given the following post, respond as if you're commenting on Reddit:
human
How do rockets burn fuel in space if there isnt oxygen in space?
gpt
They bring the oxygen with them in the rocket! There are two parts to the fuel a rocket carries: the fuel and the oxidizer. The oxidizer is not oxygen gas, it's either a solid compound that plays the same chemical role (like ammonium perchlorate) or a liquid (like liquid oxygen). In fact, rockets need to use the oxidizer while they are still in the atmosphere as well, because they need to burn so much fuel so quickly.