The model of the solar system by the student would contain an error if he did not use different ball sizes which are in proportion to the size of each planet.
The solar system is the system of the Sun and it's nine planets.
The Sun is the main star and source of energy in the solar system.
The planets in the solar system are of different sizes and orbit at various distances around the Sun.
This a student modelling the solar system should use different ball sizes in proportion to the size of each planet.
Therefore, the model of the student would contain an error if he did not use different ball sizes which are in proportion to the size of each planet.
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