Daphnis and the Rings of Saturn

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Explanation: What’s happening to the rings of Saturn? Nothing much, just a little moon making waves. The moon is 8-kilometer Daphnis and it is making waves in the Keeler Gap of Saturn’s rings using just its gravity — as it bobs up and down, in and out.

from Pocket https://apod.nasa.gov/apod/ap170222.html
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