Answer:
they have to travel a greater distance to make one full orbit around the Sun
Step-by-step explanation:
- Planets further away from the Sun take longer to orbit because they have to travel a greater distance to make one full orbit around the Sun. This greater distance also means that their orbital speed is slower.
- This is because their orbital velocity, which is determined by the force of gravity between the Sun and the planet, is weaker the further away you get from the Sun.
- Therefore, planets that are further away from the Sun take longer to complete one full orbit around the Sun than those which are closer.