Is Saturn's rings due to the Roche's Limit?

The four gas giants (Jupiter, Saturn, Uranus, and Neptune) each have material inside of their Roche limits; this is why they each have rings while the smaller inner planets (Mercury, Venus, Earth, and Mars) do not. read more

A large comet collides with a moon near the Roche limit, breaking apart the moon. A collision occurs between two moons near the Roche limit, shattering both. Medium-sized moons are torn apart as they pass into Saturn's Roche limit. read more

Particles in the inner rings orbit Saturn at a faster speed than particles in the outer rings. read more