system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is the speed of light 299 792 458 m / s? Would our universe sill exist as we know it if the speed of light was instant?
gpt
The universe would breakdown instantly if the speed of light was infinite. Alot of the laws of the universe derive from the speed of light   
Take Einstein's famous equation E = MC^2 . C is the speed of light. So a star would produce uncountably infinite amounts of energy. Matter would never congeal out of the big bang, because it would take uncountably infinite amounts of energy to produce a single gram of hydrogen.