system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Tsiolkovsky Rocket Equation

The title says all.
gpt
The amount of fuel for a change in velocity goes up exponentially with the size of the change. What that means is that every time you want to *add* a bit more to your speed, you *multiply* your fuel requirements, which makes them get rapidly out of hand.

The reason for it is that when you add more fuel to your ship, you also have to *lift* more fuel at first. And if you add more fuel to lift that, you have to lift that extra fuel, too. And so on and so forth.