What Influence Do Pairs of Shepherd Moons Have on the Giant

question 53

Multiple Choice

What influence do pairs of shepherd moons have on the giant planets' rings?

• A) They gravitationally pull material off each other, reinforcing the rings.
• B) They only allow the rocky ring systems to remain stable while destabilizing the icy ring systems.
• C) They cause the rings to eventually fall into Saturn by gravitational tugs on the ring particles.
• D) They keep rings between the pair narrow by gravitational tugs on the ring particles.
• E) They prevent rings from forming between their respective orbits.

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