Rings form because something big and heavy got too close to whatever it was orbiting and the near side and far side wanted to orbit at different speeds. These forces rip the moon apart and a ring forms.
If you tried to place a solid disk in orbit around a planet, the same thing would happen.
Relentless_Fiend t1_j5bpk6v wrote
Reply to Can planetary rings be a solid surface? by barbadizzy
Rings form because something big and heavy got too close to whatever it was orbiting and the near side and far side wanted to orbit at different speeds. These forces rip the moon apart and a ring forms.
If you tried to place a solid disk in orbit around a planet, the same thing would happen.