From 5:45 - 6:00, watch two of Saturn's shepherd moons herd ring particles:
If you watch the ring, not the moons, you can see the "ripple" in the ring as the moons pass.
If you love space, this entire Crash Course Astronomy video series is well worth watching. It's free on youtube, with the inimitable Phil Plait of the always interesting and informative Bad Astronomy blog as narrator.
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