Could you make a planet out of Saturn's rings?

Illustrator and author Ron Miller visualizes what we would see in our skies if Saturn's majestic rings circled the Earth. ... Miller strived to make the images scientifically accurate, adding nice touches like orange-pink shadows resulting from sunlight passing through the Earth's atmosphere. read more

So, you could make a significant moon out of the rings (and that’s probably what they were before they became a ring), but you could not make a planet. Because the resulting object would be too small to be a sphere. read more

A hypothesis was proposed a few years back that suggested a moon with an icy shell may have gotten close enough to Saturn that this icy shell was ripped off to create the rings, while somehow the more rocky portions of the moon continued to spiral into Saturn itself. While this can explain the composition of the rings, it still leaves questions about why very small, rocky moons remain within the system. read more

Simple answer: the rings combined could probably make a “planet” the size of Mimas. Plus, this thing will keep orbiting Saturn, making it a moon. read more