Have you ever tried making a solar system with a asteroid belt? If you have, you know how time-consuming it can be. But, I think I may have figured out a way to make a star with a asteroid belt, and it's easier than you think. So we have to first generate our star (If you don't know how to, you can use a procedural star), But chances are you already know how to do that. Then load up SE and find out how many planets there are. Close SE and then put in the stars code:
RemovePlanet Mystar 1
Repeat that until there are no planets left. If it is a dwarf planet, Replace RemovePlanet with RemoveDwarfPlanet. After that, when you launch SE, all that should be left are the asteroids, and then you have made your asteroid belt.
"You can't spell Challenge without change. You need to change to overcome challenges." -Bo Dallas
Obviously, then, they must be from the future, from a time when it does..
Living among the stars, I find my way. I grow in strength through knowledge of the space I occupy, until I become the ruler of my own interstellar empire of sorts. Though The world was made for the day, I was made for the night, and thus, the universe itself is within my destiny.