The other thing that's sort of impressive is it gives us an idea of the sheer scale of the speed of light. The fastest macro object we've ever created (I'm sure there's tiny things we've made and then gotten going really fast with a particle accelerator) can only go 0.058% of the speed of light. There's this speed limit of the universe at c, but it's so fast we can't even hit 0.1% of that speed limit.