system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What makes light so fast?

I'm not good at understanding complex concepts in physics, so I was hoping that someone could explain this to me like I was five. What makes light so fast? Why can nothing else in the universe, besides darkness, travel so incredibly fast like light can?
gpt
LY5, the more something weighs, the harder it is to make it go fast. Throwing a baseball is easy and you can make it go 50 mph with some effort. You can't push a car that fast because it weighs so much. 

Light weighs nothing and so it can go at the speed limit of the universe. Which we call the speed of light.