Planets with larger orbital radii have longer orbital periods because they both have a longer distance to travel in each orbit and move more slowly.

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According to Kepler's laws of planetary motion, planets with larger orbital radii have longer orbital periods because they have to travel a greater distance around their orbit and move at a slower velocity, which results in a longer time to complete each orbit.

Planets with Larger Orbital Radii Have Longer Orbital Periods Because