01-28-2015, 06:32 AM
Saturn's largest ring, the very faint Phoebe ring, is 300 x Saturn's radius; about 18 million km. These rings around J1407b are 60 million km in radius, so maybe not that much wider, even if they are much denser.
Saturn's Hill Sphere is about 65 million km, so it could just conceivably have rings as big as this, but I think that very dense large rings would collapse into moons quite quickly.
Saturn's Hill Sphere is about 65 million km, so it could just conceivably have rings as big as this, but I think that very dense large rings would collapse into moons quite quickly.