The Saturnian Satellite Pan Moves Along the Encke Gap

question 65

Multiple Choice

The Saturnian satellite Pan moves along the Encke gap.Suppose a rock is orbiting within the gap at an orbital radius slightly smaller than that of Pan.Which passage is a CORRECT description of the interaction between Pan and the rock?

• A) Pan catches up to and passes the rock. As it does so, it pulls back on the rock, slowing it and causing it to move in an orbit with a larger radius.
• B) Pan catches up to and passes the rock. As it does so, it pulls back on the rock, slowing it and causing it to move in an orbit with a smaller radius.
• C) The rock catches up to and passes Pan. As it does so, Pan pulls itself forward, making it move faster and causing it to move into an orbit with a larger radius.
• D) The rock catches up to and passes Pan. As it does so, Pan pulls itself forward, making it move faster and causing it to move into an orbit with a smaller radius.

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