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When creating a scale model of the Solar System using a tennis ball to represent the Sun, why would it be impractical to accurately represent the distance to Neptune?

1 ) 

The materials needed would be too expensive

2 ) 

The distance would require a space larger than a typical field

3 ) 

The size difference between Neptune and the Sun would be too difficult to represent

4 ) 

The model would be too heavy to transport

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