Question

Why do outer planets have rings but the inner planets don't?

Answer 1

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There is no definite answer to this, but according to theories Rings and formed when a moon comes too close to the planet that the gravity of the planet collapses the moon onto the planet thus forming Rings.Because the outer Planets have large number of Moons this theory might be true but it's not definite.

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Answer 2

ANSWER:-

One theory is that the rings formed at the same time as the planet and its major moons. In this case, if material is close to the planet, the planet's gravitational pull is too strong to coalesce into a moon and the particles that would otherwise form a moon spread out in orbit around the planet as a ring.