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Gravity had them I guess. Saturn's going to lose the rings as well, and "soon" (hundreds or thousands of years).

Did you mean hundreds or thounsands of millions of years?

About 100-300 million years, and they only formed sometime in the last 100 million. A blink of an eye from a cosmic standpoint.

For comparison, the dinosaurs existed before than the rings did.

did a large collision during the era of the dinosaurs also form Saturn's rings then? If so what residual evidence of that collision do we know about?

Yes, my bad